diff --git a/libavformat/swf.h b/libavformat/swf.h
index 8a99c9624d..5326192871 100644
--- a/libavformat/swf.h
+++ b/libavformat/swf.h
@@ -23,6 +23,8 @@
 #ifndef AVFORMAT_SWF_H
 #define AVFORMAT_SWF_H
 
+#include "config.h"
+
 #if CONFIG_ZLIB
 #include <zlib.h>
 #endif