diff --git a/EdkUnixPkg/Dxe/UnixThunk/Bus/SimpleFileSystem/UnixSimpleFileSystem.c b/EdkUnixPkg/Dxe/UnixThunk/Bus/SimpleFileSystem/UnixSimpleFileSystem.c
index 51403ebea7..a1d63cf07c 100644
--- a/EdkUnixPkg/Dxe/UnixThunk/Bus/SimpleFileSystem/UnixSimpleFileSystem.c
+++ b/EdkUnixPkg/Dxe/UnixThunk/Bus/SimpleFileSystem/UnixSimpleFileSystem.c
@@ -1539,7 +1539,7 @@ Returns:
   }
 
 Done:
-  OldTpl = gBS->RaiseTPL (EFI_TPL_CALLBACK);
+  gBS->RestoreTPL (OldTpl);
   return Status;
 }