diff --git a/Python/mystrtoul.c b/Python/mystrtoul.c
index 10ddc6ec2fc..e7c0a570bf5 100644
--- a/Python/mystrtoul.c
+++ b/Python/mystrtoul.c
@@ -26,6 +26,8 @@ OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 #include "config.h"
 #endif
 
+#include "rename2.h"
+
 /* strtol and strtoul, renamed to avoid conflicts */
 
 /*