diff --git a/MdePkg/Include/Library/UefiLib.h b/MdePkg/Include/Library/UefiLib.h
index 3098f57298..9eed35ba16 100644
--- a/MdePkg/Include/Library/UefiLib.h
+++ b/MdePkg/Include/Library/UefiLib.h
@@ -84,7 +84,7 @@ EfiCreateProtocolNotifyEvent(
   IN  EFI_TPL           NotifyTpl,
   IN  EFI_EVENT_NOTIFY  NotifyFunction,
   IN  VOID              *NotifyContext,  OPTIONAL
-  OUT VOID              *Registration
+  OUT VOID              **Registration
   );
 
 /**
@@ -109,7 +109,7 @@ EfiNamedEventListen (
   IN EFI_TPL           NotifyTpl,
   IN EFI_EVENT_NOTIFY  NotifyFunction,
   IN CONST VOID        *NotifyContext,  OPTIONAL
-  OUT VOID             **Registration
+  OUT VOID             *Registration OPTIONAL
   );
 
 /**
diff --git a/MdePkg/Library/UefiLib/UefiLib.c b/MdePkg/Library/UefiLib/UefiLib.c
index 0ce36fce7b..e8883b49f8 100644
--- a/MdePkg/Library/UefiLib/UefiLib.c
+++ b/MdePkg/Library/UefiLib/UefiLib.c
@@ -155,7 +155,7 @@ EfiNamedEventListen (
   IN EFI_TPL           NotifyTpl,
   IN EFI_EVENT_NOTIFY  NotifyFunction,
   IN CONST VOID        *NotifyContext,  OPTIONAL
-  OUT VOID             *Registration    OPTIONAL
+  OUT VOID             *Registration OPTIONAL
   )
 {
   EFI_STATUS  Status;