diff --git a/libavformat/matroska.h b/libavformat/matroska.h
index 40ab3a7424..0d0d0bcff4 100644
--- a/libavformat/matroska.h
+++ b/libavformat/matroska.h
@@ -148,7 +148,8 @@
 #define MATROSKA_ID_TAGNAME             0x45A3
 #define MATROSKA_ID_TAGSTRING           0x4487
 #define MATROSKA_ID_TAGLANG             0x447A
-#define MATROSKA_ID_TAGDEFAULT          0x44B4
+#define MATROSKA_ID_TAGDEFAULT          0x4484
+#define MATROSKA_ID_TAGDEFAULT_BUG      0x44B4
 #define MATROSKA_ID_TAGTARGETS          0x63C0
 #define MATROSKA_ID_TAGTARGETS_TYPE       0x63CA
 #define MATROSKA_ID_TAGTARGETS_TYPEVALUE  0x68CA
diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index 33e3d884ed..75da12a3cc 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -426,6 +426,7 @@ static EbmlSyntax matroska_simpletag[] = {
     { MATROSKA_ID_TAGSTRING,          EBML_UTF8, 0, offsetof(MatroskaTag,string) },
     { MATROSKA_ID_TAGLANG,            EBML_STR,  0, offsetof(MatroskaTag,lang), {.s="und"} },
     { MATROSKA_ID_TAGDEFAULT,         EBML_UINT, 0, offsetof(MatroskaTag,def) },
+    { MATROSKA_ID_TAGDEFAULT_BUG,     EBML_UINT, 0, offsetof(MatroskaTag,def) },
     { MATROSKA_ID_SIMPLETAG,          EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTag,sub), {.n=matroska_simpletag} },
     { 0 }
 };