diff --git a/lib/rtsp.c b/lib/rtsp.c
index 8ba168cb5b..b39b8a740b 100644
--- a/lib/rtsp.c
+++ b/lib/rtsp.c
@@ -887,6 +887,7 @@ static CURLcode rtsp_rtp_write_resp(struct Curl_easy *data,
       result = rtsp_filter_rtp(data, rtspc, buf, blen, &consumed);
       if(result)
         goto out;
+      buf += consumed;
       blen -= consumed;
     }
   }