diff --git a/include/freerdp/settings.h b/include/freerdp/settings.h
index 59fe00f97..187c9ed7d 100644
--- a/include/freerdp/settings.h
+++ b/include/freerdp/settings.h
@@ -100,6 +100,7 @@ extern "C"
 #define CS_MONITOR 0xC005
 #define CS_MCS_MSGCHANNEL 0xC006
 #define CS_MONITOR_EX 0xC008
+#define CS_UNUSED1 0xC00C
 #define CS_MULTITRANSPORT 0xC00A
 
 /* Server to Client (SC) data blocks */
diff --git a/libfreerdp/core/gcc.c b/libfreerdp/core/gcc.c
index ca2548d81..9d521376c 100644
--- a/libfreerdp/core/gcc.c
+++ b/libfreerdp/core/gcc.c
@@ -558,6 +558,11 @@ BOOL gcc_write_conference_create_response(wStream* s, wStream* userData)
 	                              0); /* array of server data blocks */
 }
 
+BOOL gcc_read_client_unused1_data(wStream* s)
+{
+	return Stream_SafeSeek(s, 2);
+}
+
 BOOL gcc_read_client_data_blocks(wStream* s, rdpMcs* mcs, UINT16 length)
 {
 	WINPR_ASSERT(s);
@@ -623,6 +628,12 @@ BOOL gcc_read_client_data_blocks(wStream* s, rdpMcs* mcs, UINT16 length)
 
 				break;
 
+			case CS_UNUSED1:
+				if (!gcc_read_client_unused1_data(sub))
+					return FALSE;
+
+				break;
+
 			case 0xC009:
 			case CS_MULTITRANSPORT:
 				if (!gcc_read_client_multitransport_channel_data(sub, mcs))
@@ -736,6 +747,9 @@ char* gcc_block_type_string(UINT16 type, char* buffer, size_t size)
 		case CS_MONITOR_EX:
 			_snprintf(buffer, size, "CS_MONITOR_EX [0x%04" PRIx16 "]", type);
 			break;
+		case CS_UNUSED1:
+			_snprintf(buffer, size, "CS_UNUSED1 [0x%04" PRIx16 "]", type);
+			break;
 		case CS_MULTITRANSPORT:
 			_snprintf(buffer, size, "CS_MONITOR_EX [0x%04" PRIx16 "]", type);
 			break;