diff --git a/Python/mystrtoul.c b/Python/mystrtoul.c
index cfe0074..b5ea751 100644
--- a/Python/mystrtoul.c
+++ b/Python/mystrtoul.c
@@ -29,7 +29,7 @@
 
 ******************************************************************/
 
-#include "config.h"
+#include "Python.h"
 
 #if defined(__sgi) && defined(WITH_THREAD) && !defined(_SGI_MP_SOURCE)
 #define _SGI_MP_SOURCE