diff --git a/src/textual/app.py b/src/textual/app.py
index 538a5f5193..8fce6798de 100644
--- a/src/textual/app.py
+++ b/src/textual/app.py
@@ -310,7 +310,7 @@ class MyApp(App[None]):
             ...
         ```
     """
-    SCREENS: ClassVar[dict[str, Screen | Callable[[], Screen]]] = {}
+    SCREENS: ClassVar[dict[str, Screen[Any] | Callable[[], Screen[Any]]]] = {}
     """Screens associated with the app for the lifetime of the app."""
 
     AUTO_FOCUS: ClassVar[str | None] = "*"