diff --git a/MdePkg/Include/Protocol/SmmBase2.h b/MdePkg/Include/Protocol/SmmBase2.h
index dc1b218774..4f986188c8 100644
--- a/MdePkg/Include/Protocol/SmmBase2.h
+++ b/MdePkg/Include/Protocol/SmmBase2.h
@@ -68,7 +68,7 @@ typedef
 EFI_STATUS
 (EFIAPI *EFI_SMM_GET_SMST_LOCATION)(
   IN CONST EFI_SMM_BASE2_PROTOCOL  *This,
-  IN OUT EFI_SMM_SYSTEM_TABLE      **Smst
+  IN OUT EFI_SMM_SYSTEM_TABLE2     **Smst
   )
 ;