diff --git a/demo/routes.py b/demo/routes.py
index 991abaf..4b3996e 100644
--- a/demo/routes.py
+++ b/demo/routes.py
@@ -6,7 +6,6 @@ def setup_routes(app):
   app.router.add_routes([aiohttp.web.get('/index.html', frontend.index),
                          aiohttp.web.post('/submit', frontend.button_clicked),
                          aiohttp.web.get('/index_2.html', frontend.index_2),
-                         aiohttp.web.get('/ws', frontend.websocket_handler)
-                        ]
+                         aiohttp.web.get('/ws', frontend.websocket_handler),]
                         )
   
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