diff --git a/MdePkg/Include/Protocol/S3SaveState.h b/MdePkg/Include/Protocol/S3SaveState.h
index 9e7b4050f6..7de08ce84d 100644
--- a/MdePkg/Include/Protocol/S3SaveState.h
+++ b/MdePkg/Include/Protocol/S3SaveState.h
@@ -1,11 +1,11 @@
 /** @file
-  S3 Save State Protocol as defined in PI1.2 Specification VOLUME 5 Standard.
+  S3 Save State Protocol as defined in PI 1.6(Errata A) Specification VOLUME 5 Standard.
 
   This protocol is used by DXE PI module to store or record various IO operations
   to be replayed during an S3 resume.
   This protocol is not required for all platforms.
 
-  Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2009 - 2019, Intel Corporation. All rights reserved.<BR>
   This program and the accompanying materials
   are licensed and made available under the terms and conditions of the BSD License
   which accompanies this distribution.  The full text of the license may be found at
@@ -52,7 +52,7 @@ typedef
 EFI_STATUS
 (EFIAPI *EFI_S3_SAVE_STATE_WRITE)(
    IN CONST EFI_S3_SAVE_STATE_PROTOCOL  *This,
-   IN       UINT16                      OpCode,
+   IN       UINTN                       OpCode,
    ...
 );
 
@@ -98,7 +98,7 @@ EFI_STATUS
    IN CONST EFI_S3_SAVE_STATE_PROTOCOL  *This,
    IN       BOOLEAN                     BeforeOrAfter,
    IN OUT   EFI_S3_BOOT_SCRIPT_POSITION *Position       OPTIONAL,
-   IN       UINT16                      OpCode,
+   IN       UINTN                       OpCode,
    ...
 );