diff --git a/matter_server/server/server.py b/matter_server/server/server.py
index 7e04ff84..72a50c37 100644
--- a/matter_server/server/server.py
+++ b/matter_server/server/server.py
@@ -89,7 +89,7 @@ async def _handle_shutdown(app: web.Application) -> None:
         for client in set(clients):
             await client.disconnect()
 
-    server.app.on_shutdown.append(_handle_shutdown)
+    server.app.on_shutdown.append(_handle_shutdown)  # type: ignore[arg-type]
     server.app.router.add_route("GET", path, _handle_ws)