diff --git a/libavformat/rtpdec_jpeg.c b/libavformat/rtpdec_jpeg.c
index 3f53887798..944758d4fc 100644
--- a/libavformat/rtpdec_jpeg.c
+++ b/libavformat/rtpdec_jpeg.c
@@ -246,6 +246,10 @@ static int jpeg_parse_packet(AVFormatContext *ctx, PayloadContext *jpeg,
                "Unimplemented RTP/JPEG restart marker header.\n");
         return AVERROR_PATCHWELCOME;
     }
+    if (type > 1) {
+        av_log(ctx, AV_LOG_ERROR, "Unimplemented RTP/JPEG type %d\n", type);
+        return AVERROR_PATCHWELCOME;
+    }
 
     /* Parse the quantization table header. */
     if (off == 0) {