diff --git a/arch/sh/include/cpu-sh4/cpu/sh7786.h b/arch/sh/include/cpu-sh4/cpu/sh7786.h
index 96b8cb1f754a9556b428c1de4c6481f653bde334..029bbadaf7ab50ac6ecbac8964b750604db4481c 100644
--- a/arch/sh/include/cpu-sh4/cpu/sh7786.h
+++ b/arch/sh/include/cpu-sh4/cpu/sh7786.h
@@ -135,7 +135,7 @@ enum {
 
 static inline u32 sh7786_mm_sel(void)
 {
-	return __raw_readl(0xFC400020) & 0x7;
+	return __raw_readl((const volatile void __iomem *)0xFC400020) & 0x7;
 }
 
 #endif /* __CPU_SH7786_H__ */