diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 450092c..b526947 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -60,7 +60,7 @@
 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
 #define roundup(x, y) (					\
 {							\
-	typeof(y) __y = y;				\
+	const typeof(y) __y = y;			\
 	(((x) + (__y - 1)) / __y) * __y;		\
 }							\
 )