diff --git a/libavformat/isom.c b/libavformat/isom.c
index 3894c228e0..7d5d6248c1 100644
--- a/libavformat/isom.c
+++ b/libavformat/isom.c
@@ -261,6 +261,8 @@ const AVCodecTag codec_movaudio_tags[] = {
     { CODEC_ID_GSM,  MKTAG('a', 'g', 's', 'm') },
     { CODEC_ID_ALAC, MKTAG('a', 'l', 'a', 'c') }, /* Apple Lossless */
 
+    { CODEC_ID_NELLYMOSER, MKTAG('n', 'm', 'o', 's') },
+
     { CODEC_ID_QCELP, MKTAG('Q','c','l','p') },
     { CODEC_ID_QCELP, MKTAG('Q','c','l','q') },
     { CODEC_ID_QCELP, MKTAG('s','q','c','p') }, /* ISO Media fourcc */