diff --git a/arch/m32r/include/asm/page.h b/arch/m32r/include/asm/page.h
index 11777f7a5628e7a7324f298ba41cfb01aa10118d..725ede8f28890efc8494888f17b3f7fbe1d6ba78 100644
--- a/arch/m32r/include/asm/page.h
+++ b/arch/m32r/include/asm/page.h
@@ -1,9 +1,11 @@
 #ifndef _ASM_M32R_PAGE_H
 #define _ASM_M32R_PAGE_H
 
+#include <linux/const.h>
+
 /* PAGE_SHIFT determines the page size */
 #define PAGE_SHIFT	12
-#define PAGE_SIZE	(1UL << PAGE_SHIFT)
+#define PAGE_SIZE	(_AC(1, UL) << PAGE_SHIFT)
 #define PAGE_MASK	(~(PAGE_SIZE-1))
 
 #ifndef __ASSEMBLY__