diff --git a/MdePkg/Library/PeiServicesTablePointerLib/PeiServicesTablePointer.c b/MdePkg/Library/PeiServicesTablePointerLib/PeiServicesTablePointer.c
index fd5bbe7192..e3aafe99ca 100644
--- a/MdePkg/Library/PeiServicesTablePointerLib/PeiServicesTablePointer.c
+++ b/MdePkg/Library/PeiServicesTablePointerLib/PeiServicesTablePointer.c
@@ -45,6 +45,7 @@ SetPeiServicesTablePointer (
 
 **/
 CONST EFI_PEI_SERVICES **
+EFIAPI
 GetPeiServicesTablePointer (
   VOID
   )