diff --git a/MdePkg/Include/IndustryStandard/TpmPtp.h b/MdePkg/Include/IndustryStandard/TpmPtp.h
index 0796512688..c7ff8fdc58 100644
--- a/MdePkg/Include/IndustryStandard/TpmPtp.h
+++ b/MdePkg/Include/IndustryStandard/TpmPtp.h
@@ -2,7 +2,7 @@
   Platform TPM Profile Specification definition for TPM2.0.
   It covers both FIFO and CRB interface.
 
-Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2016 - 2018, 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
@@ -338,7 +338,8 @@ typedef union {
     UINT32   InterfaceType:4;
     UINT32   InterfaceVersion:4;
     UINT32   CapLocality:1;
-    UINT32   Reserved1:2;
+    UINT32   CapCRBIdleBypass:1;
+    UINT32   Reserved1:1;
     UINT32   CapDataXferSizeSupport:2;
     UINT32   CapFIFO:1;
     UINT32   CapCRB:1;