diff --git a/libavformat/rawenc.c b/libavformat/rawenc.c
index 8b50fe1f17..9b77cdcab2 100644
--- a/libavformat/rawenc.c
+++ b/libavformat/rawenc.c
@@ -205,7 +205,7 @@ AVOutputFormat ff_h263_muxer = {
 AVOutputFormat ff_h264_muxer = {
     .name              = "h264",
     .long_name         = NULL_IF_CONFIG_SMALL("raw H.264 video"),
-    .extensions        = "h264",
+    .extensions        = "h264,264",
     .audio_codec       = AV_CODEC_ID_NONE,
     .video_codec       = AV_CODEC_ID_H264,
     .write_header      = force_one_stream,