diff --git a/qt/aqt/gui_hooks.py b/qt/aqt/gui_hooks.py
index ca8c4bb90..d96bfb277 100644
--- a/qt/aqt/gui_hooks.py
+++ b/qt/aqt/gui_hooks.py
@@ -7,7 +7,7 @@ See pylib/anki/hooks.py
 
 from __future__ import annotations
 
-from typing import Any, Callable, List, Optional, Tuple, Sequence
+from typing import Any, Callable, List, Optional, Tuple, Union, Sequence
 
 import anki
 import aqt