diff --git a/libavformat/rtp.c b/libavformat/rtp.c
index 9a7d44b0b4..eab8271c4f 100644
--- a/libavformat/rtp.c
+++ b/libavformat/rtp.c
@@ -107,7 +107,7 @@ int ff_rtp_get_payload_type(AVFormatContext *fmt,
     /* static payload type */
     for (i = 0; AVRtpPayloadTypes[i].pt >= 0; ++i)
         if (AVRtpPayloadTypes[i].codec_id == codec->codec_id) {
-            if (codec->codec_id == AV_CODEC_ID_H263 && (!fmt ||
+            if (codec->codec_id == AV_CODEC_ID_H263 && (!fmt || !fmt->oformat ||
                 !fmt->oformat->priv_class || !fmt->priv_data ||
                 !av_opt_flag_is_set(fmt->priv_data, "rtpflags", "rfc2190")))
                 continue;