diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h
index b2bc7dbc1fa6a7965ecd780e14dc63fe9b92518c..49bb9a020a09aeba74c0eacf0e43ca668ed4339a 100644
--- a/arch/arm64/include/asm/io.h
+++ b/arch/arm64/include/asm/io.h
@@ -119,7 +119,8 @@ static inline u64 __raw_readq(const volatile void __iomem *addr)
 	 */								\
 	asm volatile("eor	%0, %1, %1\n"				\
 		     "cbnz	%0, ."					\
-		     : "=r" (tmp) : "r" (v) : "memory");		\
+		     : "=r" (tmp) : "r" ((unsigned long)(v))		\
+		     : "memory");					\
 })
 
 #define __iowmb()		wmb()