diff --git a/MdePkg/Include/Protocol/Security2.h b/MdePkg/Include/Protocol/Security2.h
index 2d85b4ba9f..91b85b2154 100644
--- a/MdePkg/Include/Protocol/Security2.h
+++ b/MdePkg/Include/Protocol/Security2.h
@@ -80,7 +80,7 @@ typedef struct _EFI_SECURITY2_ARCH_PROTOCOL    EFI_SECURITY2_ARCH_PROTOCOL;
 **/
 typedef EFI_STATUS (EFIAPI *EFI_SECURITY2_FILE_AUTHENTICATION) (
   IN CONST EFI_SECURITY2_ARCH_PROTOCOL *This,
-  IN CONST EFI_DEVICE_PATH_PROTOCOL    *DevicePath,
+  IN CONST EFI_DEVICE_PATH_PROTOCOL    *File, OPTIONAL
   IN VOID                              *FileBuffer,
   IN UINTN                             FileSize,
   IN BOOLEAN                           BootPolicy