diff --git a/libavformat/rtsp.c b/libavformat/rtsp.c
index 41427ae08e..d828c8d09b 100644
--- a/libavformat/rtsp.c
+++ b/libavformat/rtsp.c
@@ -1681,7 +1681,7 @@ int ff_rtsp_fetch_packet(AVFormatContext *s, AVPacket *pkt)
     case RTSP_LOWER_TRANSPORT_UDP:
     case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
         len = udp_read_packet(s, &rtsp_st, rt->recvbuf, RECVBUF_SIZE, wait_end);
-        if (len >=0 && rtsp_st->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
+        if (len > 0 && rtsp_st->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
             rtp_check_and_send_back_rr(rtsp_st->transport_priv, len);
         break;
     }