diff --git a/EdkNt32Pkg/Dxe/WinNtThunk/Bus/BlockIo/WinNtBlockIo.c b/EdkNt32Pkg/Dxe/WinNtThunk/Bus/BlockIo/WinNtBlockIo.c
index 143d6b5a1e..5e7a985ed6 100644
--- a/EdkNt32Pkg/Dxe/WinNtThunk/Bus/BlockIo/WinNtBlockIo.c
+++ b/EdkNt32Pkg/Dxe/WinNtThunk/Bus/BlockIo/WinNtBlockIo.c
@@ -945,7 +945,7 @@ WinNtBlockIoWriteBlocks (
   Status = EFI_SUCCESS;
 
 Done:
-  OldTpl = gBS->RaiseTPL (EFI_TPL_CALLBACK);
+  gBS->RestoreTPL (OldTpl);
   return Status;
 
 }
diff --git a/EdkNt32Pkg/Dxe/WinNtThunk/Bus/SimpleFileSystem/WinNtSimpleFileSystem.c b/EdkNt32Pkg/Dxe/WinNtThunk/Bus/SimpleFileSystem/WinNtSimpleFileSystem.c
index 525b45d78e..0b5e538da7 100644
--- a/EdkNt32Pkg/Dxe/WinNtThunk/Bus/SimpleFileSystem/WinNtSimpleFileSystem.c
+++ b/EdkNt32Pkg/Dxe/WinNtThunk/Bus/SimpleFileSystem/WinNtSimpleFileSystem.c
@@ -1658,7 +1658,7 @@ Returns:
   }
 
 Done:
-  OldTpl = gBS->RaiseTPL (EFI_TPL_CALLBACK);
+  gBS->RestoreTPL (OldTpl);
   return Status;
 }