diff --git a/app/qt/main_window.py b/app/qt/main_window.py
index e945ef9..44cc455 100644
--- a/app/qt/main_window.py
+++ b/app/qt/main_window.py
@@ -607,7 +607,7 @@ class MainWindow(QtWidgets.QMainWindow, I18nMixin):
         self._toolbar_buttons: Dict[str, ToolbarButton] = {}
         for key, icon_txt, text_key in buttons:
             label = self._t(text_key)
-            button = ToolbarButton(icon_txt, label, lambda k=key: self._invoke_action(k))
+            button = ToolbarButton(icon_txt, label, lambda _checked=False, k=key: self._invoke_action(k))
             layout.addWidget(button)
             self._toolbar_buttons[key] = button