diff --git a/libavformat/isom.c b/libavformat/isom.c
index b252e78..5e50e9f 100644
--- a/libavformat/isom.c
+++ b/libavformat/isom.c
@@ -292,6 +292,7 @@ const AVCodecTag ff_codec_movaudio_tags[] = {
     { AV_CODEC_ID_QDM2,            MKTAG('Q', 'D', 'M', '2') },
     { AV_CODEC_ID_QDMC,            MKTAG('Q', 'D', 'M', 'C') },
     { AV_CODEC_ID_SPEEX,           MKTAG('s', 'p', 'e', 'x') }, /* Flash Media Server */
+    { AV_CODEC_ID_TRUEHD,          MKTAG('m', 'l', 'p', 'a') },
     { AV_CODEC_ID_WMAV2,           MKTAG('W', 'M', 'A', '2') },
     { AV_CODEC_ID_NONE, 0 },
 };