diff --git a/libavcodec/mpeg12.c b/libavcodec/mpeg12.c
index a19378146b..73630b9dbe 100644
--- a/libavcodec/mpeg12.c
+++ b/libavcodec/mpeg12.c
@@ -25,6 +25,8 @@
  * MPEG-1/2 decoder
  */
 
+#define UNCHECKED_BITSTREAM_READER 1
+
 //#define DEBUG
 #include "internal.h"
 #include "avcodec.h"