diff --git a/vunit/ui/packagefacade.py b/vunit/ui/packagefacade.py
index afa71ca67..0bc4e7960 100644
--- a/vunit/ui/packagefacade.py
+++ b/vunit/ui/packagefacade.py
@@ -10,8 +10,8 @@
 
 from pathlib import Path
 from typing import List, Optional, Union, TYPE_CHECKING
-from vunit.design_unit import DesignUnit
 
+from vunit.design_unit import DesignUnit
 from vunit.ui.source import SourceFileList
 from ..com import codec_generator