diff --git a/arch/arm/mach-sunxi/board.c b/arch/arm/mach-sunxi/board.c
index 52be5b0551..58fbacb774 100644
--- a/arch/arm/mach-sunxi/board.c
+++ b/arch/arm/mach-sunxi/board.c
@@ -188,7 +188,8 @@ void s_init(void)
 	asm volatile(
 		"mrc p15, 0, r0, c1, c0, 1\n"
 		"orr r0, r0, #1 << 6\n"
-		"mcr p15, 0, r0, c1, c0, 1\n");
+		"mcr p15, 0, r0, c1, c0, 1\n"
+		::: "r0");
 #endif
 #if defined CONFIG_MACH_SUN6I || defined CONFIG_MACH_SUN8I_H3
 	/* Enable non-secure access to some peripherals */