diff --git a/libswscale/swscale_internal.h b/libswscale/swscale_internal.h
index 2c172e7889..fe14b129a6 100644
--- a/libswscale/swscale_internal.h
+++ b/libswscale/swscale_internal.h
@@ -21,6 +21,8 @@
 #ifndef FFMPEG_SWSCALE_INTERNAL_H
 #define FFMPEG_SWSCALE_INTERNAL_H
 
+#include "config.h"
+
 #ifdef HAVE_ALTIVEC_H
 #include <altivec.h>
 #endif