diff --git a/MdePkg/Include/IndustryStandard/WindowsUxCapsule.h b/MdePkg/Include/IndustryStandard/WindowsUxCapsule.h
index 6908218c5b..62247c4196 100644
--- a/MdePkg/Include/IndustryStandard/WindowsUxCapsule.h
+++ b/MdePkg/Include/IndustryStandard/WindowsUxCapsule.h
@@ -13,8 +13,9 @@
 
 --*/
 
-#ifndef _WINDOWS_UX_CAPSULE_GUID_H
-#define _WINDOWS_UX_CAPSULE_GUID_H
+
+#ifndef _WINDOWS_UX_CAPSULE_GUID_H_
+#define _WINDOWS_UX_CAPSULE_GUID_H_
 
 #pragma pack(1)