diff --git a/MdePkg/Include/Guid/ImageAuthentication.h b/MdePkg/Include/Guid/ImageAuthentication.h
index b965a42549..5e97c3c848 100644
--- a/MdePkg/Include/Guid/ImageAuthentication.h
+++ b/MdePkg/Include/Guid/ImageAuthentication.h
@@ -70,26 +70,26 @@ typedef struct {
   ///
   /// An identifier which identifies the agent which added the signature to the list.
   ///
-  EFI_GUID	        SignatureOwner;
+  EFI_GUID          SignatureOwner;
   ///
   /// The format of the signature is defined by the SignatureType.
   ///
-  UINT8		          SignatureData[1];
+  UINT8             SignatureData[1];
 } EFI_SIGNATURE_DATA;
 
 typedef struct {
   ///
   /// Type of the signature. GUID signature types are defined in below.
   ///
-  EFI_GUID          	SignatureType;
+  EFI_GUID            SignatureType;
   ///
   /// Total size of the signature list, including this header.
   ///
-  UINT32            	SignatureListSize;
+  UINT32              SignatureListSize;
   ///
   /// Size of the signature header which precedes the array of signatures.
   ///
-  UINT32            	SignatureHeaderSize;
+  UINT32              SignatureHeaderSize;
   ///
   /// Size of each signature.
   ///
@@ -176,7 +176,7 @@ typedef struct {
   ///
   /// Describes the action taken by the firmware regarding this image.
   ///
-  EFI_IMAGE_EXECUTION_ACTION 	  Action;
+  EFI_IMAGE_EXECUTION_ACTION    Action;
   ///
   /// Size of all of the entire structure.
   ///
@@ -204,7 +204,7 @@ typedef struct {
   ///
   WIN_CERTIFICATE               ImageHash;
   ///
-  /// Zero or more image signatures. If the image contained no signtures, 
+  /// Zero or more image signatures. If the image contained no signatures, 
   /// then this field is empty.
   ///
   WIN_CERTIFICATE               Signature;
diff --git a/MdePkg/Library/PeiServicesLib/PeiServicesLib.c b/MdePkg/Library/PeiServicesLib/PeiServicesLib.c
index 5782e5132f..7311633c93 100644
--- a/MdePkg/Library/PeiServicesLib/PeiServicesLib.c
+++ b/MdePkg/Library/PeiServicesLib/PeiServicesLib.c
@@ -1,7 +1,7 @@
 /** @file
   Implementation for PEI Services Library.
 
-  Copyright (c) 2006 - 2008, Intel Corporation<BR>
+  Copyright (c) 2006 - 2009, Intel Corporation<BR>
   All rights reserved. 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
@@ -570,7 +570,7 @@ PeiServicesInstallFvInfoPpi (
   FvInfoPpi->FvInfoSize = FvInfoSize;
   if (ParentFvName != NULL) {
     ParentFvNameValue = AllocateCopyPool (sizeof (EFI_GUID), ParentFvName);
-	ASSERT (ParentFvNameValue != NULL);
+    ASSERT (ParentFvNameValue != NULL);
     FvInfoPpi->ParentFvName = ParentFvNameValue;
   }
   if (ParentFileName != NULL) {