diff --git a/api/app_factory.py b/api/app_factory.py
index 7e7a4bf8c8..1859e531b5 100644
--- a/api/app_factory.py
+++ b/api/app_factory.py
@@ -63,7 +63,7 @@ def create_flask_app_with_configs() -> DifyApp:
     return dify_app
 
 
-def create_app() -> tuple[Any, DifyApp]:
+def create_app() -> tuple[socketio.WSGIApp, DifyApp]:
     start_time = time.perf_counter()
     app = create_flask_app_with_configs()
     initialize_extensions(app)