diff --git a/Modules/mathmodule.c b/Modules/mathmodule.c
index 260511400ec..4c678a83a31 100644
--- a/Modules/mathmodule.c
+++ b/Modules/mathmodule.c
@@ -1,7 +1,7 @@
 /* Math module -- standard C math library functions, pi and e */
 
 #include "Python.h"
-#include "longintrepr.h"
+#include "longintrepr.h" // just for SHIFT
 
 #ifndef _MSC_VER
 #ifndef __STDC__