diff --git a/arch/arm/include/asm/atomic.h b/arch/arm/include/asm/atomic.h
index a0162fa9456496662adb28898fcb44776e628414..e9e56c00b858c628aa375660ad1ce121377c9187 100644
--- a/arch/arm/include/asm/atomic.h
+++ b/arch/arm/include/asm/atomic.h
@@ -440,7 +440,7 @@ static inline int atomic64_add_unless(atomic64_t *v, u64 a, u64 u)
 "	teq	%2, #0\n"
 "	bne	1b\n"
 "2:"
-	: "=&r" (val), "=&r" (ret), "=&r" (tmp)
+	: "=&r" (val), "+r" (ret), "=&r" (tmp)
 	: "r" (&v->counter), "r" (u), "r" (a)
 	: "cc");