diff --git a/libavcodec/ac3dec.c b/libavcodec/ac3dec.c
index 19ceac3645..a1f4cc85dd 100644
--- a/libavcodec/ac3dec.c
+++ b/libavcodec/ac3dec.c
@@ -32,8 +32,6 @@
 #include <math.h>
 #include <string.h>
 
-#define ALT_BITSTREAM_READER
-
 #include "avcodec.h"
 #include "ac3.h"
 #include "ac3tab.h"