diff --git a/tests/test_shutdown.py b/tests/test_shutdown.py
index 1bff696..d2b1fd4 100644
--- a/tests/test_shutdown.py
+++ b/tests/test_shutdown.py
@@ -48,7 +48,7 @@ async def mark_shutdown_started(*args: typing.Any, **kwargs: typing.Any) -> None
         slow.shutdown_started.set()
         await emit_shutdown(*args, **kwargs)
 
-    dispatcher.emit_shutdown = mark_shutdown_started  # ty: ignore[invalid-assignment]
+    dispatcher.emit_shutdown = mark_shutdown_started
     container = setup_di(dispatcher, Container(groups=[Resources]), **setup_kwargs)
 
     @dispatcher.message()