diff --git a/ac3dec/libac3/bitstream.c b/ac3dec/libac3/bitstream.c
index 4d0b3ce..a22b53a 100644
--- a/ac3dec/libac3/bitstream.c
+++ b/ac3dec/libac3/bitstream.c
@@ -23,6 +23,7 @@
 
 #include <stdlib.h>
 #include <stdio.h>
+#include <string.h>
 
 #include "ac3.h"
 #include "ac3_internal.h"