diff --git a/arch/m32r/include/asm/io.h b/arch/m32r/include/asm/io.h
index 4010f1fc5b65ba1fc01217f071d897af5a33c125..6e7787f3dac7bb52f87ec33378193b14f65bf70c 100644
--- a/arch/m32r/include/asm/io.h
+++ b/arch/m32r/include/asm/io.h
@@ -161,6 +161,9 @@ static inline void _writel(unsigned long l, unsigned long addr)
 #define __raw_writeb writeb
 #define __raw_writew writew
 #define __raw_writel writel
+#define writeb_relaxed writeb
+#define writew_relaxed writew
+#define writel_relaxed writel
 
 #define ioread8 read
 #define ioread16 readw