diff --git a/.mypy.ini b/.mypy.ini
index bc5670dbe..818bcfb26 100644
--- a/.mypy.ini
+++ b/.mypy.ini
@@ -50,6 +50,8 @@ strict_optional = True
 strict_optional = True
 [mypy-aqt.taglimit]
 strict_optional = True
+[mypy-aqt.modelchooser]
+strict_optional = True
 [mypy-aqt.deckdescription]
 strict_optional = True
 [mypy-aqt.deckbrowser]
diff --git a/qt/aqt/modelchooser.py b/qt/aqt/modelchooser.py
index cdc75cd06..15c5347e4 100644
--- a/qt/aqt/modelchooser.py
+++ b/qt/aqt/modelchooser.py
@@ -84,6 +84,7 @@ class ModelChooser(QHBoxLayout):
             if not ret.name:
                 return
             m = self.deck.models.by_name(ret.name)
+            assert m is not None
             self.deck.conf["curModel"] = m["id"]
             cdeck = self.deck.decks.current()
             cdeck["mid"] = m["id"]