diff --git a/libavformat/matroska.c b/libavformat/matroska.c
index e8e99967db..d281ef4fd5 100644
--- a/libavformat/matroska.c
+++ b/libavformat/matroska.c
@@ -35,7 +35,7 @@ const CodecTags ff_mkv_codec_tags[]={
     {"A_MPEG/L2"        , AV_CODEC_ID_MP2},
     {"A_MPEG/L1"        , AV_CODEC_ID_MP2},
     {"A_MPEG/L3"        , AV_CODEC_ID_MP3},
-    {"A_OPUS",            AV_CODEC_ID_OPUS},
+    {"A_OPUS"           , AV_CODEC_ID_OPUS},
     {"A_OPUS/EXPERIMENTAL",AV_CODEC_ID_OPUS},
     {"A_PCM/FLOAT/IEEE" , AV_CODEC_ID_PCM_F32LE},
     {"A_PCM/FLOAT/IEEE" , AV_CODEC_ID_PCM_F64LE},