diff --git a/demos/websocket/chatdemo.py b/demos/websocket/chatdemo.py
index aac24d94..5642f1fd 100755
--- a/demos/websocket/chatdemo.py
+++ b/demos/websocket/chatdemo.py
@@ -44,7 +44,7 @@ class Application(tornado.web.Application):
             static_path=os.path.join(os.path.dirname(__file__), "static"),
             xsrf_cookies=True,
         )
-        tornado.web.Application.__init__(self, handlers, **settings)
+        super(Application, self).__init__(handlers, **settings)
 
 
 class MainHandler(tornado.web.RequestHandler):