diff --git a/libavformat/asfdec.c b/libavformat/asfdec.c
index ed02d40fb9..30642a61fa 100644
--- a/libavformat/asfdec.c
+++ b/libavformat/asfdec.c
@@ -21,6 +21,7 @@
 
 //#define DEBUG
 
+#include "libavutil/bswap.h"
 #include "libavutil/common.h"
 #include "libavutil/avstring.h"
 #include "libavcodec/mpegaudio.h"