diff --git a/cartridges/ui/window.py b/cartridges/ui/window.py
index 2b05f11..6424b5d 100644
--- a/cartridges/ui/window.py
+++ b/cartridges/ui/window.py
@@ -76,7 +76,7 @@ class Window(Adw.ApplicationWindow):
         ))
 
     @Gtk.Template.Callback()
-    def _if_else(self, _obj, condition: bool, first: _T, second: _T) -> _T:
+    def _if_else(self, _obj, condition: object, first: _T, second: _T) -> _T:
         return first if condition else second
 
     @Gtk.Template.Callback()