diff --git a/plat/arm/css/drivers/mhu/css_mhu_doorbell.c b/plat/arm/css/drivers/mhu/css_mhu_doorbell.c
index 54f3e05..b3203c2 100644
--- a/plat/arm/css/drivers/mhu/css_mhu_doorbell.c
+++ b/plat/arm/css/drivers/mhu/css_mhu_doorbell.c
@@ -4,8 +4,10 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#include <arch_helpers.h>
 #include <platform_def.h>
+
+#include <arch_helpers.h>
+
 #include "css_mhu_doorbell.h"
 #include "../scmi/scmi.h"