diff --git a/MdePkg/Include/Library/PeiPiLib.h b/MdePkg/Include/Library/PeiPiLib.h
index 341ae81aae..8729612c15 100644
--- a/MdePkg/Include/Library/PeiPiLib.h
+++ b/MdePkg/Include/Library/PeiPiLib.h
@@ -40,11 +40,11 @@
 VOID
 EFIAPI
 PiLibInstallFvInfoPpi (
-  IN EFI_GUID                *FvFormat, OPTIONAL
-  IN VOID                    *FvInfo,
-  IN UINT32                  FvInfoSize,
-  IN EFI_GUID                *ParentFvName, OPTIONAL
-  IN EFI_GUID                *PraentFileName OPTIONAL
+  IN CONST EFI_GUID                *FvFormat, OPTIONAL
+  IN CONST VOID                    *FvInfo,
+  IN       UINT32                  FvInfoSize,
+  IN CONST EFI_GUID                *ParentFvName, OPTIONAL
+  IN CONST EFI_GUID                *PraentFileName OPTIONAL
 );
 
 #endif