diff --git a/libavformat/mpeg.h b/libavformat/mpeg.h
index cf10d6a4c4..55f9e0cb51 100644
--- a/libavformat/mpeg.h
+++ b/libavformat/mpeg.h
@@ -57,7 +57,6 @@
 #define STREAM_TYPE_VIDEO_CAVS      0x42
 
 #define STREAM_TYPE_AUDIO_AC3       0x81
-#define STREAM_TYPE_AUDIO_DTS       0x8a
 
 static const int lpcm_freq_tab[4] = { 48000, 96000, 44100, 32000 };