diff --git a/mpbswap.h b/mpbswap.h
index 709235fded..70d7d20e30 100644
--- a/mpbswap.h
+++ b/mpbswap.h
@@ -3,6 +3,8 @@
 
 #include <sys/types.h>
 #include "libavutil/bswap.h"
+#include "config.h"
+
 #ifndef HAVE_SWAB
 void swab(const void *from, void *to, ssize_t n);
 #endif