diff --git a/janus/src/rtp.h b/janus/src/rtp.h
index d6f09da..2bc7f9b 100644
--- a/janus/src/rtp.h
+++ b/janus/src/rtp.h
@@ -29,6 +29,9 @@
 #define US_RTP_DATAGRAM_SIZE	1200
 #define US_RTP_HEADER_SIZE		12
 
+#define US_RTP_VIDEO_PAYLOAD	96
+#define US_RTP_AUDIO_PAYLOAD	111
+
 
 typedef struct {
 	uint	payload;
diff --git a/janus/src/rtpa.c b/janus/src/rtpa.c
index e704d41..82eb52a 100644
--- a/janus/src/rtpa.c
+++ b/janus/src/rtpa.c
@@ -33,7 +33,7 @@ us_rtpa_s *us_rtpa_init(us_rtp_callback_f callback) {
 	us_rtpa_s *rtpa;
 	US_CALLOC(rtpa, 1);
 	rtpa->rtp = us_rtp_init();
-	us_rtp_assign(rtpa->rtp, 111, false);
+	us_rtp_assign(rtpa->rtp, US_RTP_AUDIO_PAYLOAD, false);
 	rtpa->callback = callback;
 	return rtpa;
 }
diff --git a/janus/src/rtpv.c b/janus/src/rtpv.c
index 715f87e..79aea56 100644
--- a/janus/src/rtpv.c
+++ b/janus/src/rtpv.c
@@ -45,7 +45,7 @@ us_rtpv_s *us_rtpv_init(us_rtp_callback_f callback) {
 	us_rtpv_s *rtpv;
 	US_CALLOC(rtpv, 1);
 	rtpv->rtp = us_rtp_init();
-	us_rtp_assign(rtpv->rtp, 96, true);
+	us_rtp_assign(rtpv->rtp, US_RTP_VIDEO_PAYLOAD, true);
 	rtpv->callback = callback;
 	return rtpv;
 }