diff --git a/MdePkg/Include/Library/PeiServicesTablePointerLib.h b/MdePkg/Include/Library/PeiServicesTablePointerLib.h
index a5b32a565b..973598870e 100644
--- a/MdePkg/Include/Library/PeiServicesTablePointerLib.h
+++ b/MdePkg/Include/Library/PeiServicesTablePointerLib.h
@@ -42,18 +42,5 @@ SetPeiServicesTablePointer (
   EFI_PEI_SERVICES ** PeiServicesTablePointer
   );
 
-/**
-  After memory initialization in PEI phase, the IDT table in temporary memory should 
-  be migrated to memory, and the address of PeiServicesPointer also need to be updated  
-  immediately preceding the new IDT table.
-  
-  @param    PeiServices   The address of PeiServices pointer.
-**/
-VOID
-EFIAPI
-MigrateIdtTable (
-  IN EFI_PEI_SERVICES  **PeiServices
-  );
-  
 #endif