diff --git a/arch/arm/mach-iop32x/glantank.c b/arch/arm/mach-iop32x/glantank.c
index c15a100ba779..02e20c3912ba 100644
--- a/arch/arm/mach-iop32x/glantank.c
+++ b/arch/arm/mach-iop32x/glantank.c
@@ -183,7 +183,7 @@ static struct i2c_board_info __initdata glantank_i2c_devices[] = {
 
 static void glantank_power_off(void)
 {
-	__raw_writeb(0x01, 0xfe8d0004);
+	__raw_writeb(0x01, IOMEM(0xfe8d0004));
 
 	while (1)
 		;