diff --git a/MdePkg/Library/PeiPcdLib/PeiPcdLib.c b/MdePkg/Library/PeiPcdLib/PeiPcdLib.c
index c7aed6dbda..57cf646f6e 100644
--- a/MdePkg/Library/PeiPcdLib/PeiPcdLib.c
+++ b/MdePkg/Library/PeiPcdLib/PeiPcdLib.c
@@ -869,6 +869,8 @@ LibPcdCallbackOnSet (
 {
   EFI_STATUS Status;
 
+  ASSERT (NotificationFunction != NULL);
+
   Status = (GetPcdPpiPointer ())->CallbackOnSet (Guid, TokenNumber, NotificationFunction);
 
   ASSERT_EFI_ERROR (Status);
@@ -902,6 +904,8 @@ LibPcdCancelCallback (
 {
   EFI_STATUS Status;
 
+  ASSERT (NotificationFunction != NULL);
+
   Status = (GetPcdPpiPointer ())->CancelCallback (Guid, TokenNumber, NotificationFunction);
 
   ASSERT_EFI_ERROR (Status);