diff --git a/MdePkg/Include/Ppi/PiPcd.h b/MdePkg/Include/Ppi/PiPcd.h
index 90984ac84b..d0b43ca8c9 100644
--- a/MdePkg/Include/Ppi/PiPcd.h
+++ b/MdePkg/Include/Ppi/PiPcd.h
@@ -114,7 +114,7 @@ UINT32
   @return 64-bit value for a given PCD token.  
 **/
 typedef
-UINT32
+UINT64
 (EFIAPI *EFI_PEI_PCD_PPI_GET_EX_64)(
   IN CONST  EFI_GUID  *Guid,
   IN        UINTN     TokenNumber
@@ -285,7 +285,7 @@ EFI_STATUS
 (EFIAPI *EFI_PEI_PCD_PPI_SET_EX_POINTER)(
   IN CONST  EFI_GUID  *Guid,
   IN        UINTN     TokenNumber,
-  IN        UINTN     SizeOfValue,
+  IN OUT    UINTN     *SizeOfValue,
   IN        VOID      *Buffer
 );
 
diff --git a/MdePkg/Include/Protocol/PiPcd.h b/MdePkg/Include/Protocol/PiPcd.h
index 6bf56a96fb..19376f411d 100644
--- a/MdePkg/Include/Protocol/PiPcd.h
+++ b/MdePkg/Include/Protocol/PiPcd.h
@@ -288,7 +288,7 @@ EFI_STATUS
 (EFIAPI *EFI_PCD_PROTOCOL_SET_EX_POINTER)(
   IN CONST  EFI_GUID  *Guid,
   IN        UINTN     TokenNumber,
-  IN        UINTN     SizeOfValue,
+  IN        UINTN     *SizeOfValue,
   IN        VOID      *Buffer
 );