diff --git a/ArmPkg/Drivers/MmCommunicationDxe/MmCommunicate.h b/ArmPkg/Drivers/MmCommunicationDxe/MmCommunicate.h
index fcc346ba7e..32753947e1 100644
--- a/ArmPkg/Drivers/MmCommunicationDxe/MmCommunicate.h
+++ b/ArmPkg/Drivers/MmCommunicationDxe/MmCommunicate.h
@@ -1,13 +1,13 @@
 /** @file
 
-  Copyright (c) 2016-2018, ARM Limited. All rights reserved.
+  Copyright (c) 2016-2021, Arm Limited. All rights reserved.<BR>
 
   SPDX-License-Identifier: BSD-2-Clause-Patent
 
 **/
 
-#if !defined _MM_COMMUNICATE_H_
-#define _MM_COMMUNICATE_H_
+#ifndef MM_COMMUNICATE_H_
+#define MM_COMMUNICATE_H_
 
 #define MM_MAJOR_VER_MASK        0xEFFF0000
 #define MM_MINOR_VER_MASK        0x0000FFFF
@@ -19,4 +19,4 @@
 #define MM_CALLER_MAJOR_VER      0x1UL
 #define MM_CALLER_MINOR_VER      0x0
 
-#endif /* _MM_COMMUNICATE_H_ */
+#endif /* MM_COMMUNICATE_H_ */