diff --git a/libavformat/riff.c b/libavformat/riff.c
index ae6b7baca885e6943142927ce534f5696f126b5e..0c9c274bf01388e9fbb9a0ec77d77807526b5f1f 100644
--- a/libavformat/riff.c
+++ b/libavformat/riff.c
@@ -53,6 +53,7 @@ const AVCodecTag codec_bmp_tags[] = {
     { CODEC_ID_MPEG4,        MKTAG('S', 'E', 'D', 'G') },
     { CODEC_ID_MPEG4,        MKTAG('R', 'M', 'P', '4') },
     { CODEC_ID_MPEG4,        MKTAG('3', 'I', 'V', '2') },
+    { CODEC_ID_MPEG4,        MKTAG('F', 'F', 'D', 'S') },
     { CODEC_ID_MSMPEG4V3,    MKTAG('D', 'I', 'V', '3') }, /* default signature when using MSMPEG4 */
     { CODEC_ID_MSMPEG4V3,    MKTAG('M', 'P', '4', '3') },
     { CODEC_ID_MSMPEG4V3,    MKTAG('M', 'P', 'G', '3') },