diff --git a/include/freerdp/utils/pcap.h b/include/freerdp/utils/pcap.h
index 4b23343b2..43ce42f68 100644
--- a/include/freerdp/utils/pcap.h
+++ b/include/freerdp/utils/pcap.h
@@ -49,7 +49,11 @@ typedef struct _pcap_record pcap_record;
 struct _pcap_record
 {
 	pcap_record_header header;
-	void* data;
+	union
+	{
+		void* data;
+		const void* cdata;
+	};
 	UINT32 length;
 	pcap_record* next;
 };
@@ -76,7 +80,7 @@ extern "C"
 	FREERDP_API rdpPcap* pcap_open(char* name, BOOL write);
 	FREERDP_API void pcap_close(rdpPcap* pcap);
 
-	FREERDP_API BOOL pcap_add_record(rdpPcap* pcap, void* data, UINT32 length);
+	FREERDP_API BOOL pcap_add_record(rdpPcap* pcap, const void* data, UINT32 length);
 	FREERDP_API BOOL pcap_has_next_record(rdpPcap* pcap);
 	FREERDP_API BOOL pcap_get_next_record(rdpPcap* pcap, pcap_record* record);
 	FREERDP_API BOOL pcap_get_next_record_header(rdpPcap* pcap, pcap_record* record);
diff --git a/libfreerdp/utils/pcap.c b/libfreerdp/utils/pcap.c
index 6f6ed258a..923391023 100644
--- a/libfreerdp/utils/pcap.c
+++ b/libfreerdp/utils/pcap.c
@@ -95,10 +95,10 @@ static BOOL pcap_read_record(rdpPcap* pcap, pcap_record* record)
 static BOOL pcap_write_record(rdpPcap* pcap, pcap_record* record)
 {
 	return pcap_write_record_header(pcap, &record->header) &&
-	       (fwrite(record->data, record->length, 1, pcap->fp) == 1);
+	       (fwrite(record->cdata, record->length, 1, pcap->fp) == 1);
 }
 
-BOOL pcap_add_record(rdpPcap* pcap, void* data, UINT32 length)
+BOOL pcap_add_record(rdpPcap* pcap, const void* data, UINT32 length)
 {
 	pcap_record* record;
 	struct timeval tp;
@@ -126,7 +126,7 @@ BOOL pcap_add_record(rdpPcap* pcap, void* data, UINT32 length)
 	if (pcap->record == NULL)
 		pcap->record = record;
 
-	record->data = data;
+	record->cdata = data;
 	record->length = length;
 	record->header.incl_len = length;
 	record->header.orig_len = length;