diff --git a/server/proxy/channels/pf_channel_rdpdr.c b/server/proxy/channels/pf_channel_rdpdr.c
index c533102a3..f596eb2bb 100644
--- a/server/proxy/channels/pf_channel_rdpdr.c
+++ b/server/proxy/channels/pf_channel_rdpdr.c
@@ -521,8 +521,9 @@ static UINT rdpdr_send_client_name_request(pClientContext* pc, pf_channel_client
 
 #define rdpdr_ignore_capset(srv, log, s, header) \
 	rdpdr_ignore_capset_((srv), (log), (s), header, __func__)
-static UINT rdpdr_ignore_capset_(BOOL srv, wLog* log, wStream* s,
-                                 const RDPDR_CAPABILITY_HEADER* header, const char* fkt)
+static UINT rdpdr_ignore_capset_(WINPR_ATTR_UNUSED BOOL srv, WINPR_ATTR_UNUSED wLog* log,
+                                 wStream* s, const RDPDR_CAPABILITY_HEADER* header,
+                                 WINPR_ATTR_UNUSED const char* fkt)
 {
 	WINPR_ASSERT(s);
 	WINPR_ASSERT(header);
@@ -1509,8 +1510,8 @@ static BOOL pf_channel_rdpdr_common_context_new(pf_channel_common_context* commo
 }
 
 static BOOL pf_channel_rdpdr_client_pass_message(pServerContext* ps, pClientContext* pc,
-                                                 UINT16 channelId, const char* channel_name,
-                                                 wStream* s)
+                                                 WINPR_ATTR_UNUSED UINT16 channelId,
+                                                 const char* channel_name, wStream* s)
 {
 	pf_channel_client_context* rdpdr = NULL;
 
diff --git a/server/proxy/cli/freerdp_proxy.c b/server/proxy/cli/freerdp_proxy.c
index 099cd35c2..5e7574cc6 100644
--- a/server/proxy/cli/freerdp_proxy.c
+++ b/server/proxy/cli/freerdp_proxy.c
@@ -89,7 +89,7 @@ static int version(const char* app)
 	return 0;
 }
 
-static int buildconfig(const char* app)
+static int buildconfig(WINPR_ATTR_UNUSED const char* app)
 {
 	printf("This is FreeRDP version %s (%s)\n", FREERDP_VERSION_FULL, FREERDP_GIT_REVISION);
 	printf("%s", freerdp_get_build_config());
diff --git a/server/proxy/modules/bitmap-filter/bitmap-filter.cpp b/server/proxy/modules/bitmap-filter/bitmap-filter.cpp
index 49542101e..ec8b6c462 100644
--- a/server/proxy/modules/bitmap-filter/bitmap-filter.cpp
+++ b/server/proxy/modules/bitmap-filter/bitmap-filter.cpp
@@ -118,7 +118,9 @@ class DynChannelState
 	uint32_t _channelId = 0;
 };
 
-static BOOL filter_client_pre_connect(proxyPlugin* plugin, proxyData* pdata, void* custom)
+static BOOL filter_client_pre_connect([[maybe_unused]] proxyPlugin* plugin,
+                                      [[maybe_unused]] proxyData* pdata,
+                                      [[maybe_unused]] void* custom)
 {
 	WINPR_ASSERT(plugin);
 	WINPR_ASSERT(pdata);
@@ -131,7 +133,9 @@ static BOOL filter_client_pre_connect(proxyPlugin* plugin, proxyData* pdata, voi
 	return freerdp_settings_set_bool(settings, FreeRDP_BitmapCachePersistEnabled, FALSE);
 }
 
-static BOOL filter_dyn_channel_intercept_list(proxyPlugin* plugin, proxyData* pdata, void* arg)
+static BOOL filter_dyn_channel_intercept_list([[maybe_unused]] proxyPlugin* plugin,
+                                              [[maybe_unused]] proxyData* pdata,
+                                              [[maybe_unused]] void* arg)
 {
 	auto data = static_cast<proxyChannelToInterceptData*>(arg);
 
@@ -146,7 +150,9 @@ static BOOL filter_dyn_channel_intercept_list(proxyPlugin* plugin, proxyData* pd
 	return TRUE;
 }
 
-static BOOL filter_static_channel_intercept_list(proxyPlugin* plugin, proxyData* pdata, void* arg)
+static BOOL filter_static_channel_intercept_list([[maybe_unused]] proxyPlugin* plugin,
+                                                 [[maybe_unused]] proxyData* pdata,
+                                                 [[maybe_unused]] void* arg)
 {
 	auto data = static_cast<proxyChannelToInterceptData*>(arg);
 
diff --git a/server/proxy/modules/demo/demo.cpp b/server/proxy/modules/demo/demo.cpp
index 8cfff27dc..1b592d761 100644
--- a/server/proxy/modules/demo/demo.cpp
+++ b/server/proxy/modules/demo/demo.cpp
@@ -36,7 +36,7 @@ struct demo_custom_data
 static constexpr char plugin_name[] = "demo";
 static constexpr char plugin_desc[] = "this is a test plugin";
 
-static BOOL demo_plugin_unload(proxyPlugin* plugin)
+static BOOL demo_plugin_unload([[maybe_unused]] proxyPlugin* plugin)
 {
 	WINPR_ASSERT(plugin);
 
@@ -49,7 +49,9 @@ static BOOL demo_plugin_unload(proxyPlugin* plugin)
 	return TRUE;
 }
 
-static BOOL demo_client_init_connect(proxyPlugin* plugin, proxyData* pdata, void* custom)
+static BOOL demo_client_init_connect([[maybe_unused]] proxyPlugin* plugin,
+                                     [[maybe_unused]] proxyData* pdata,
+                                     [[maybe_unused]] void* custom)
 {
 	WINPR_ASSERT(plugin);
 	WINPR_ASSERT(pdata);
@@ -59,7 +61,9 @@ static BOOL demo_client_init_connect(proxyPlugin* plugin, proxyData* pdata, void
 	return TRUE;
 }
 
-static BOOL demo_client_uninit_connect(proxyPlugin* plugin, proxyData* pdata, void* custom)
+static BOOL demo_client_uninit_connect([[maybe_unused]] proxyPlugin* plugin,
+                                       [[maybe_unused]] proxyData* pdata,
+                                       [[maybe_unused]] void* custom)
 {
 	WINPR_ASSERT(plugin);
 	WINPR_ASSERT(pdata);
@@ -69,7 +73,9 @@ static BOOL demo_client_uninit_connect(proxyPlugin* plugin, proxyData* pdata, vo
 	return TRUE;
 }
 
-static BOOL demo_client_pre_connect(proxyPlugin* plugin, proxyData* pdata, void* custom)
+static BOOL demo_client_pre_connect([[maybe_unused]] proxyPlugin* plugin,
+                                    [[maybe_unused]] proxyData* pdata,
+                                    [[maybe_unused]] void* custom)
 {
 	WINPR_ASSERT(plugin);
 	WINPR_ASSERT(pdata);
@@ -79,7 +85,9 @@ static BOOL demo_client_pre_connect(proxyPlugin* plugin, proxyData* pdata, void*
 	return TRUE;
 }
 
-static BOOL demo_client_post_connect(proxyPlugin* plugin, proxyData* pdata, void* custom)
+static BOOL demo_client_post_connect([[maybe_unused]] proxyPlugin* plugin,
+                                     [[maybe_unused]] proxyData* pdata,
+                                     [[maybe_unused]] void* custom)
 {
 	WINPR_ASSERT(plugin);
 	WINPR_ASSERT(pdata);
@@ -89,7 +97,9 @@ static BOOL demo_client_post_connect(proxyPlugin* plugin, proxyData* pdata, void
 	return TRUE;
 }
 
-static BOOL demo_client_post_disconnect(proxyPlugin* plugin, proxyData* pdata, void* custom)
+static BOOL demo_client_post_disconnect([[maybe_unused]] proxyPlugin* plugin,
+                                        [[maybe_unused]] proxyData* pdata,
+                                        [[maybe_unused]] void* custom)
 {
 	WINPR_ASSERT(plugin);
 	WINPR_ASSERT(pdata);
@@ -99,7 +109,9 @@ static BOOL demo_client_post_disconnect(proxyPlugin* plugin, proxyData* pdata, v
 	return TRUE;
 }
 
-static BOOL demo_client_x509_certificate(proxyPlugin* plugin, proxyData* pdata, void* custom)
+static BOOL demo_client_x509_certificate([[maybe_unused]] proxyPlugin* plugin,
+                                         [[maybe_unused]] proxyData* pdata,
+                                         [[maybe_unused]] void* custom)
 {
 	WINPR_ASSERT(plugin);
 	WINPR_ASSERT(pdata);
@@ -109,7 +121,9 @@ static BOOL demo_client_x509_certificate(proxyPlugin* plugin, proxyData* pdata,
 	return TRUE;
 }
 
-static BOOL demo_client_login_failure(proxyPlugin* plugin, proxyData* pdata, void* custom)
+static BOOL demo_client_login_failure([[maybe_unused]] proxyPlugin* plugin,
+                                      [[maybe_unused]] proxyData* pdata,
+                                      [[maybe_unused]] void* custom)
 {
 	WINPR_ASSERT(plugin);
 	WINPR_ASSERT(pdata);
@@ -119,7 +133,8 @@ static BOOL demo_client_login_failure(proxyPlugin* plugin, proxyData* pdata, voi
 	return TRUE;
 }
 
-static BOOL demo_client_end_paint(proxyPlugin* plugin, proxyData* pdata, void* custom)
+static BOOL demo_client_end_paint([[maybe_unused]] proxyPlugin* plugin,
+                                  [[maybe_unused]] proxyData* pdata, [[maybe_unused]] void* custom)
 {
 	WINPR_ASSERT(plugin);
 	WINPR_ASSERT(pdata);
@@ -129,7 +144,8 @@ static BOOL demo_client_end_paint(proxyPlugin* plugin, proxyData* pdata, void* c
 	return TRUE;
 }
 
-static BOOL demo_client_redirect(proxyPlugin* plugin, proxyData* pdata, void* custom)
+static BOOL demo_client_redirect([[maybe_unused]] proxyPlugin* plugin,
+                                 [[maybe_unused]] proxyData* pdata, [[maybe_unused]] void* custom)
 {
 	WINPR_ASSERT(plugin);
 	WINPR_ASSERT(pdata);
@@ -139,7 +155,9 @@ static BOOL demo_client_redirect(proxyPlugin* plugin, proxyData* pdata, void* cu
 	return TRUE;
 }
 
-static BOOL demo_server_post_connect(proxyPlugin* plugin, proxyData* pdata, void* custom)
+static BOOL demo_server_post_connect([[maybe_unused]] proxyPlugin* plugin,
+                                     [[maybe_unused]] proxyData* pdata,
+                                     [[maybe_unused]] void* custom)
 {
 	WINPR_ASSERT(plugin);
 	WINPR_ASSERT(pdata);
@@ -149,7 +167,9 @@ static BOOL demo_server_post_connect(proxyPlugin* plugin, proxyData* pdata, void
 	return TRUE;
 }
 
-static BOOL demo_server_peer_activate(proxyPlugin* plugin, proxyData* pdata, void* custom)
+static BOOL demo_server_peer_activate([[maybe_unused]] proxyPlugin* plugin,
+                                      [[maybe_unused]] proxyData* pdata,
+                                      [[maybe_unused]] void* custom)
 {
 	WINPR_ASSERT(plugin);
 	WINPR_ASSERT(pdata);
@@ -159,7 +179,9 @@ static BOOL demo_server_peer_activate(proxyPlugin* plugin, proxyData* pdata, voi
 	return TRUE;
 }
 
-static BOOL demo_server_channels_init(proxyPlugin* plugin, proxyData* pdata, void* custom)
+static BOOL demo_server_channels_init([[maybe_unused]] proxyPlugin* plugin,
+                                      [[maybe_unused]] proxyData* pdata,
+                                      [[maybe_unused]] void* custom)
 {
 	WINPR_ASSERT(plugin);
 	WINPR_ASSERT(pdata);
@@ -169,7 +191,9 @@ static BOOL demo_server_channels_init(proxyPlugin* plugin, proxyData* pdata, voi
 	return TRUE;
 }
 
-static BOOL demo_server_channels_free(proxyPlugin* plugin, proxyData* pdata, void* custom)
+static BOOL demo_server_channels_free([[maybe_unused]] proxyPlugin* plugin,
+                                      [[maybe_unused]] proxyData* pdata,
+                                      [[maybe_unused]] void* custom)
 {
 	WINPR_ASSERT(plugin);
 	WINPR_ASSERT(pdata);
@@ -179,7 +203,9 @@ static BOOL demo_server_channels_free(proxyPlugin* plugin, proxyData* pdata, voi
 	return TRUE;
 }
 
-static BOOL demo_server_session_end(proxyPlugin* plugin, proxyData* pdata, void* custom)
+static BOOL demo_server_session_end([[maybe_unused]] proxyPlugin* plugin,
+                                    [[maybe_unused]] proxyData* pdata,
+                                    [[maybe_unused]] void* custom)
 {
 	WINPR_ASSERT(plugin);
 	WINPR_ASSERT(pdata);
@@ -189,7 +215,9 @@ static BOOL demo_server_session_end(proxyPlugin* plugin, proxyData* pdata, void*
 	return TRUE;
 }
 
-static BOOL demo_filter_keyboard_event(proxyPlugin* plugin, proxyData* pdata, void* param)
+static BOOL demo_filter_keyboard_event([[maybe_unused]] proxyPlugin* plugin,
+                                       [[maybe_unused]] proxyData* pdata,
+                                       [[maybe_unused]] void* param)
 {
 	proxyPluginsManager* mgr = nullptr;
 	auto event_data = static_cast<const proxyKeyboardEventInfo*>(param);
@@ -214,7 +242,9 @@ static BOOL demo_filter_keyboard_event(proxyPlugin* plugin, proxyData* pdata, vo
 	return TRUE;
 }
 
-static BOOL demo_filter_unicode_event(proxyPlugin* plugin, proxyData* pdata, void* param)
+static BOOL demo_filter_unicode_event([[maybe_unused]] proxyPlugin* plugin,
+                                      [[maybe_unused]] proxyData* pdata,
+                                      [[maybe_unused]] void* param)
 {
 	proxyPluginsManager* mgr = nullptr;
 	auto event_data = static_cast<const proxyUnicodeEventInfo*>(param);
@@ -239,7 +269,8 @@ static BOOL demo_filter_unicode_event(proxyPlugin* plugin, proxyData* pdata, voi
 	return TRUE;
 }
 
-static BOOL demo_mouse_event(proxyPlugin* plugin, proxyData* pdata, void* param)
+static BOOL demo_mouse_event([[maybe_unused]] proxyPlugin* plugin,
+                             [[maybe_unused]] proxyData* pdata, [[maybe_unused]] void* param)
 {
 	auto event_data = static_cast<const proxyMouseEventInfo*>(param);
 
@@ -251,7 +282,8 @@ static BOOL demo_mouse_event(proxyPlugin* plugin, proxyData* pdata, void* param)
 	return TRUE;
 }
 
-static BOOL demo_mouse_ex_event(proxyPlugin* plugin, proxyData* pdata, void* param)
+static BOOL demo_mouse_ex_event([[maybe_unused]] proxyPlugin* plugin,
+                                [[maybe_unused]] proxyData* pdata, [[maybe_unused]] void* param)
 {
 	auto event_data = static_cast<const proxyMouseExEventInfo*>(param);
 
@@ -263,7 +295,9 @@ static BOOL demo_mouse_ex_event(proxyPlugin* plugin, proxyData* pdata, void* par
 	return TRUE;
 }
 
-static BOOL demo_client_channel_data(proxyPlugin* plugin, proxyData* pdata, void* param)
+static BOOL demo_client_channel_data([[maybe_unused]] proxyPlugin* plugin,
+                                     [[maybe_unused]] proxyData* pdata,
+                                     [[maybe_unused]] void* param)
 {
 	const auto* channel = static_cast<const proxyChannelDataEventInfo*>(param);
 
@@ -276,7 +310,9 @@ static BOOL demo_client_channel_data(proxyPlugin* plugin, proxyData* pdata, void
 	return TRUE;
 }
 
-static BOOL demo_server_channel_data(proxyPlugin* plugin, proxyData* pdata, void* param)
+static BOOL demo_server_channel_data([[maybe_unused]] proxyPlugin* plugin,
+                                     [[maybe_unused]] proxyData* pdata,
+                                     [[maybe_unused]] void* param)
 {
 	const auto* channel = static_cast<const proxyChannelDataEventInfo*>(param);
 
@@ -289,7 +325,9 @@ static BOOL demo_server_channel_data(proxyPlugin* plugin, proxyData* pdata, void
 	return TRUE;
 }
 
-static BOOL demo_dynamic_channel_create(proxyPlugin* plugin, proxyData* pdata, void* param)
+static BOOL demo_dynamic_channel_create([[maybe_unused]] proxyPlugin* plugin,
+                                        [[maybe_unused]] proxyData* pdata,
+                                        [[maybe_unused]] void* param)
 {
 	const auto* channel = static_cast<const proxyChannelDataEventInfo*>(param);
 
@@ -301,7 +339,9 @@ static BOOL demo_dynamic_channel_create(proxyPlugin* plugin, proxyData* pdata, v
 	return TRUE;
 }
 
-static BOOL demo_server_fetch_target_addr(proxyPlugin* plugin, proxyData* pdata, void* param)
+static BOOL demo_server_fetch_target_addr([[maybe_unused]] proxyPlugin* plugin,
+                                          [[maybe_unused]] proxyData* pdata,
+                                          [[maybe_unused]] void* param)
 {
 	auto event_data = static_cast<const proxyFetchTargetEventInfo*>(param);
 
@@ -313,7 +353,8 @@ static BOOL demo_server_fetch_target_addr(proxyPlugin* plugin, proxyData* pdata,
 	return TRUE;
 }
 
-static BOOL demo_server_peer_logon(proxyPlugin* plugin, proxyData* pdata, void* param)
+static BOOL demo_server_peer_logon([[maybe_unused]] proxyPlugin* plugin,
+                                   [[maybe_unused]] proxyData* pdata, [[maybe_unused]] void* param)
 {
 	auto info = static_cast<const proxyServerPeerLogon*>(param);
 	WINPR_ASSERT(plugin);
@@ -325,7 +366,9 @@ static BOOL demo_server_peer_logon(proxyPlugin* plugin, proxyData* pdata, void*
 	return TRUE;
 }
 
-static BOOL demo_dyn_channel_intercept_list(proxyPlugin* plugin, proxyData* pdata, void* arg)
+static BOOL demo_dyn_channel_intercept_list([[maybe_unused]] proxyPlugin* plugin,
+                                            [[maybe_unused]] proxyData* pdata,
+                                            [[maybe_unused]] void* arg)
 {
 	auto data = static_cast<proxyChannelToInterceptData*>(arg);
 
@@ -337,7 +380,9 @@ static BOOL demo_dyn_channel_intercept_list(proxyPlugin* plugin, proxyData* pdat
 	return TRUE;
 }
 
-static BOOL demo_static_channel_intercept_list(proxyPlugin* plugin, proxyData* pdata, void* arg)
+static BOOL demo_static_channel_intercept_list([[maybe_unused]] proxyPlugin* plugin,
+                                               [[maybe_unused]] proxyData* pdata,
+                                               [[maybe_unused]] void* arg)
 {
 	auto data = static_cast<proxyChannelToInterceptData*>(arg);
 
@@ -349,7 +394,9 @@ static BOOL demo_static_channel_intercept_list(proxyPlugin* plugin, proxyData* p
 	return TRUE;
 }
 
-static BOOL demo_dyn_channel_intercept(proxyPlugin* plugin, proxyData* pdata, void* arg)
+static BOOL demo_dyn_channel_intercept([[maybe_unused]] proxyPlugin* plugin,
+                                       [[maybe_unused]] proxyData* pdata,
+                                       [[maybe_unused]] void* arg)
 {
 	auto data = static_cast<proxyDynChannelInterceptData*>(arg);
 
diff --git a/server/proxy/modules/dyn-channel-dump/dyn-channel-dump.cpp b/server/proxy/modules/dyn-channel-dump/dyn-channel-dump.cpp
index 40fb12f00..93a480f0d 100644
--- a/server/proxy/modules/dyn-channel-dump/dyn-channel-dump.cpp
+++ b/server/proxy/modules/dyn-channel-dump/dyn-channel-dump.cpp
@@ -101,7 +101,7 @@ class ChannelData
 		_base /= str;
 	}
 
-	bool add(const std::string& name, bool back)
+	bool add(const std::string& name, WINPR_ATTR_UNUSED bool back)
 	{
 		std::lock_guard<std::mutex> guard(_mux);
 		if (_map.find(name) == _map.end())
@@ -285,7 +285,8 @@ static BOOL dump_dyn_channel_intercept_list(proxyPlugin* plugin, proxyData* pdat
 	return TRUE;
 }
 
-static BOOL dump_static_channel_intercept_list(proxyPlugin* plugin, proxyData* pdata, void* arg)
+static BOOL dump_static_channel_intercept_list([[maybe_unused]] proxyPlugin* plugin,
+                                               [[maybe_unused]] proxyData* pdata, void* arg)
 {
 	auto data = static_cast<proxyChannelToInterceptData*>(arg);
 
diff --git a/server/proxy/pf_client.c b/server/proxy/pf_client.c
index ed79a0bfa..b2c278c25 100644
--- a/server/proxy/pf_client.c
+++ b/server/proxy/pf_client.c
@@ -93,7 +93,7 @@ static void pf_client_on_error_info(void* ctx, const ErrorInfoEventArgs* e)
 	freerdp_send_error_info(ps->context.rdp);
 }
 
-static void pf_client_on_activated(void* ctx, const ActivatedEventArgs* e)
+static void pf_client_on_activated(void* ctx, WINPR_ATTR_UNUSED const ActivatedEventArgs* e)
 {
 	pClientContext* pc = (pClientContext*)ctx;
 	pServerContext* ps = NULL;
@@ -334,7 +334,7 @@ typedef struct
 	UINT32 backId;
 } UpdateBackIdArgs;
 
-static BOOL updateBackIdFn(const void* key, void* value, void* arg)
+static BOOL updateBackIdFn(WINPR_ATTR_UNUSED const void* key, void* value, void* arg)
 {
 	pServerStaticChannelContext* current = (pServerStaticChannelContext*)value;
 	UpdateBackIdArgs* updateArgs = (UpdateBackIdArgs*)arg;
diff --git a/server/proxy/pf_config.c b/server/proxy/pf_config.c
index 90616ae81..e1a64a6a0 100644
--- a/server/proxy/pf_config.c
+++ b/server/proxy/pf_config.c
@@ -1027,7 +1027,8 @@ static BOOL config_plugin_unload(proxyPlugin* plugin)
 	return TRUE;
 }
 
-static BOOL config_plugin_keyboard_event(proxyPlugin* plugin, proxyData* pdata, void* param)
+static BOOL config_plugin_keyboard_event(proxyPlugin* plugin, WINPR_ATTR_UNUSED proxyData* pdata,
+                                         void* param)
 {
 	BOOL rc = 0;
 	const struct config_plugin_data* custom = NULL;
@@ -1051,7 +1052,8 @@ static BOOL config_plugin_keyboard_event(proxyPlugin* plugin, proxyData* pdata,
 	return rc;
 }
 
-static BOOL config_plugin_unicode_event(proxyPlugin* plugin, proxyData* pdata, void* param)
+static BOOL config_plugin_unicode_event(proxyPlugin* plugin, WINPR_ATTR_UNUSED proxyData* pdata,
+                                        void* param)
 {
 	BOOL rc = 0;
 	const struct config_plugin_data* custom = NULL;
@@ -1075,7 +1077,8 @@ static BOOL config_plugin_unicode_event(proxyPlugin* plugin, proxyData* pdata, v
 	return rc;
 }
 
-static BOOL config_plugin_mouse_event(proxyPlugin* plugin, proxyData* pdata, void* param)
+static BOOL config_plugin_mouse_event(proxyPlugin* plugin, WINPR_ATTR_UNUSED proxyData* pdata,
+                                      void* param)
 {
 	BOOL rc = 0;
 	const struct config_plugin_data* custom = NULL;
@@ -1098,7 +1101,8 @@ static BOOL config_plugin_mouse_event(proxyPlugin* plugin, proxyData* pdata, voi
 	return rc;
 }
 
-static BOOL config_plugin_mouse_ex_event(proxyPlugin* plugin, proxyData* pdata, void* param)
+static BOOL config_plugin_mouse_ex_event(proxyPlugin* plugin, WINPR_ATTR_UNUSED proxyData* pdata,
+                                         void* param)
 {
 	BOOL rc = 0;
 	const struct config_plugin_data* custom = NULL;
@@ -1121,7 +1125,8 @@ static BOOL config_plugin_mouse_ex_event(proxyPlugin* plugin, proxyData* pdata,
 	return rc;
 }
 
-static BOOL config_plugin_client_channel_data(proxyPlugin* plugin, proxyData* pdata, void* param)
+static BOOL config_plugin_client_channel_data(WINPR_ATTR_UNUSED proxyPlugin* plugin,
+                                              WINPR_ATTR_UNUSED proxyData* pdata, void* param)
 {
 	const proxyChannelDataEventInfo* channel = (const proxyChannelDataEventInfo*)(param);
 
@@ -1134,7 +1139,8 @@ static BOOL config_plugin_client_channel_data(proxyPlugin* plugin, proxyData* pd
 	return TRUE;
 }
 
-static BOOL config_plugin_server_channel_data(proxyPlugin* plugin, proxyData* pdata, void* param)
+static BOOL config_plugin_server_channel_data(WINPR_ATTR_UNUSED proxyPlugin* plugin,
+                                              WINPR_ATTR_UNUSED proxyData* pdata, void* param)
 {
 	const proxyChannelDataEventInfo* channel = (const proxyChannelDataEventInfo*)(param);
 
@@ -1147,7 +1153,8 @@ static BOOL config_plugin_server_channel_data(proxyPlugin* plugin, proxyData* pd
 	return TRUE;
 }
 
-static BOOL config_plugin_dynamic_channel_create(proxyPlugin* plugin, proxyData* pdata, void* param)
+static BOOL config_plugin_dynamic_channel_create(proxyPlugin* plugin,
+                                                 WINPR_ATTR_UNUSED proxyData* pdata, void* param)
 {
 	BOOL accept = 0;
 	const proxyChannelDataEventInfo* channel = (const proxyChannelDataEventInfo*)(param);
@@ -1212,7 +1219,8 @@ static BOOL config_plugin_dynamic_channel_create(proxyPlugin* plugin, proxyData*
 	return accept;
 }
 
-static BOOL config_plugin_channel_create(proxyPlugin* plugin, proxyData* pdata, void* param)
+static BOOL config_plugin_channel_create(proxyPlugin* plugin, WINPR_ATTR_UNUSED proxyData* pdata,
+                                         void* param)
 {
 	BOOL accept = 0;
 	const proxyChannelDataEventInfo* channel = (const proxyChannelDataEventInfo*)(param);
diff --git a/server/proxy/pf_modules.c b/server/proxy/pf_modules.c
index 9ae969cbb..2d43cb6f3 100644
--- a/server/proxy/pf_modules.c
+++ b/server/proxy/pf_modules.c
@@ -332,8 +332,8 @@ BOOL pf_modules_run_filter(proxyModule* module, PF_FILTER_TYPE type, proxyData*
  * @context: current session server's rdpContext instance.
  * @info: pointer to per-session data.
  */
-static BOOL pf_modules_set_plugin_data(proxyPluginsManager* mgr, const char* plugin_name,
-                                       proxyData* pdata, void* data)
+static BOOL pf_modules_set_plugin_data(WINPR_ATTR_UNUSED proxyPluginsManager* mgr,
+                                       const char* plugin_name, proxyData* pdata, void* data)
 {
 	union
 	{
@@ -363,8 +363,8 @@ static BOOL pf_modules_set_plugin_data(proxyPluginsManager* mgr, const char* plu
  * if there's no data related to `plugin_name` in `context` (current session), a NULL will be
  * returned.
  */
-static void* pf_modules_get_plugin_data(proxyPluginsManager* mgr, const char* plugin_name,
-                                        proxyData* pdata)
+static void* pf_modules_get_plugin_data(WINPR_ATTR_UNUSED proxyPluginsManager* mgr,
+                                        const char* plugin_name, proxyData* pdata)
 {
 	union
 	{
@@ -378,7 +378,7 @@ static void* pf_modules_get_plugin_data(proxyPluginsManager* mgr, const char* pl
 	return HashTable_GetItemValue(pdata->modules_info, ccharconv.cp);
 }
 
-static void pf_modules_abort_connect(proxyPluginsManager* mgr, proxyData* pdata)
+static void pf_modules_abort_connect(WINPR_ATTR_UNUSED proxyPluginsManager* mgr, proxyData* pdata)
 {
 	WINPR_ASSERT(pdata);
 	WLog_DBG(TAG, "is called!");
diff --git a/server/proxy/pf_server.c b/server/proxy/pf_server.c
index d7d05bdf8..0f86806a7 100644
--- a/server/proxy/pf_server.c
+++ b/server/proxy/pf_server.c
@@ -392,7 +392,7 @@ static BOOL pf_server_logon(freerdp_peer* peer, const SEC_WINNT_AUTH_IDENTITY* i
 	return TRUE;
 }
 
-static BOOL pf_server_adjust_monitor_layout(freerdp_peer* peer)
+static BOOL pf_server_adjust_monitor_layout(WINPR_ATTR_UNUSED freerdp_peer* peer)
 {
 	WINPR_ASSERT(peer);
 	/* proxy as is, there's no need to do anything here */
diff --git a/server/proxy/pf_utils.c b/server/proxy/pf_utils.c
index f8c17af9b..9136b3bc2 100644
--- a/server/proxy/pf_utils.c
+++ b/server/proxy/pf_utils.c
@@ -70,7 +70,7 @@ end:
 	return rc;
 }
 
-BOOL pf_utils_is_passthrough(const proxyConfig* config)
+BOOL pf_utils_is_passthrough(WINPR_ATTR_UNUSED const proxyConfig* config)
 {
 	WINPR_ASSERT(config);