diff --git a/MdePkg/Include/Pi/PiPeiCis.h b/MdePkg/Include/Pi/PiPeiCis.h
index da7c46e587..c7cf4ef6cc 100644
--- a/MdePkg/Include/Pi/PiPeiCis.h
+++ b/MdePkg/Include/Pi/PiPeiCis.h
@@ -682,7 +682,7 @@ EFI_STATUS
 // PEI Services Table
 //
 #define PEI_SERVICES_SIGNATURE  0x5652455320494550
-#define PEI_SERVICES_REVISION   (PEI_SPECIFICATION_MAJOR_REVISION<<16) | (PEI_SPECIFICATION_MINOR_REVISION)
+#define PEI_SERVICES_REVISION   ((PEI_SPECIFICATION_MAJOR_REVISION<<16) | (PEI_SPECIFICATION_MINOR_REVISION))
 
 struct _EFI_PEI_SERVICES {
   EFI_TABLE_HEADER            Hdr;
diff --git a/MdePkg/Include/Ppi/PciCfg2.h b/MdePkg/Include/Ppi/PciCfg2.h
index 989720234c..7102539c2a 100644
--- a/MdePkg/Include/Ppi/PciCfg2.h
+++ b/MdePkg/Include/Ppi/PciCfg2.h
@@ -83,8 +83,8 @@ EFI_STATUS
 (EFIAPI *EFI_PEI_PCI_CFG2_PPI_IO) (
   IN CONST  EFI_PEI_SERVICES          **PeiServices,
   IN CONST  EFI_PEI_PCI_CFG2_PPI      *This,
-  IN CONST  EFI_PEI_PCI_CFG_PPI_WIDTH Width,
-  IN CONST  UINT64                    Address,
+  IN        EFI_PEI_PCI_CFG_PPI_WIDTH Width,
+  IN        UINT64                    Address,
   IN OUT    VOID                      *Buffer
 );
 
@@ -123,8 +123,8 @@ EFI_STATUS
 (EFIAPI *EFI_PEI_PCI_CFG2_PPI_RW) (
   IN CONST  EFI_PEI_SERVICES          **PeiServices,
   IN CONST  EFI_PEI_PCI_CFG2_PPI      *This,
-  IN CONST  EFI_PEI_PCI_CFG_PPI_WIDTH Width,
-  IN CONST  UINT64                    Address,
+  IN        EFI_PEI_PCI_CFG_PPI_WIDTH Width,
+  IN        UINT64                    Address,
   IN CONST  VOID                      *SetBits,
   IN CONST  VOID                      *ClearBits
 );