diff --git a/Python/mystrtoul.c b/Python/mystrtoul.c
index cfe007454d4..b5ea751068b 100644
--- a/Python/mystrtoul.c
+++ b/Python/mystrtoul.c
@@ -29,7 +29,7 @@ PERFORMANCE OF THIS SOFTWARE.
 
 ******************************************************************/
 
-#include "config.h"
+#include "Python.h"
 
 #if defined(__sgi) && defined(WITH_THREAD) && !defined(_SGI_MP_SOURCE)
 #define _SGI_MP_SOURCE