diff --git a/UefiCpuPkg/Library/MpInitLib/PeiMpLib.c b/UefiCpuPkg/Library/MpInitLib/PeiMpLib.c
index 06d966b227..e6e1b7c57d 100644
--- a/UefiCpuPkg/Library/MpInitLib/PeiMpLib.c
+++ b/UefiCpuPkg/Library/MpInitLib/PeiMpLib.c
@@ -44,21 +44,6 @@ EFI_PEI_NOTIFY_DESCRIPTOR        mS3SmmInitDoneNotifyDesc = {
   NotifyOnS3SmmInitDonePpi
 };
 
-/**
-  The function prototype for invoking a function on an Application Processor.
-
-  This definition is used by the UEFI MP Serices Protocol, and the
-  PI SMM System Table.
-
-  @param[in,out] Buffer  The pointer to private data buffer.
-**/
-VOID
-EmptyApProcedure (
-  IN OUT VOID * Buffer
-  )
-{
-}
-
 /**
   S3 SMM Init Done notification function.