diff --git a/libavformat/matroska.c b/libavformat/matroska.c
index 7905fd1ff7..6af667c36b 100644
--- a/libavformat/matroska.c
+++ b/libavformat/matroska.c
@@ -48,6 +48,7 @@ const CodecTags ff_mkv_codec_tags[]={
     {"A_PCM/INT/LIT"    , AV_CODEC_ID_PCM_S24LE},
     {"A_PCM/INT/LIT"    , AV_CODEC_ID_PCM_S32LE},
     {"A_PCM/INT/LIT"    , AV_CODEC_ID_PCM_U8},
+    {"A_QUICKTIME/QDMC" , AV_CODEC_ID_QDMC},
     {"A_QUICKTIME/QDM2" , AV_CODEC_ID_QDM2},
     {"A_REAL/14_4"      , AV_CODEC_ID_RA_144},
     {"A_REAL/28_8"      , AV_CODEC_ID_RA_288},
diff --git a/libavformat/matroskaenc.c b/libavformat/matroskaenc.c
index 1622b44e5e..1605f0cafe 100644
--- a/libavformat/matroskaenc.c
+++ b/libavformat/matroskaenc.c
@@ -2528,6 +2528,7 @@ static const AVCodecTag additional_audio_tags[] = {
     { AV_CODEC_ID_PCM_S16BE, 0xFFFFFFFF },
     { AV_CODEC_ID_PCM_S24BE, 0xFFFFFFFF },
     { AV_CODEC_ID_PCM_S32BE, 0xFFFFFFFF },
+    { AV_CODEC_ID_QDMC,      0xFFFFFFFF },
     { AV_CODEC_ID_QDM2,      0xFFFFFFFF },
     { AV_CODEC_ID_RA_144,    0xFFFFFFFF },
     { AV_CODEC_ID_RA_288,    0xFFFFFFFF },