diff --git a/_posts/2015-09-11-playing-with-websockets.markdown b/_posts/2015-09-11-playing-with-websockets.markdown
index 13e3e0d..55453ab 100644
--- a/_posts/2015-09-11-playing-with-websockets.markdown
+++ b/_posts/2015-09-11-playing-with-websockets.markdown
@@ -97,7 +97,7 @@ if __name__ == "__main__":
     factory.protocol = SomeServerProtocol
     resource = WebSocketResource(factory)
     # websockets resource on "/ws" path
-    root.putChild(u"ws", resource)
+    root.putChild(b"ws", resource)
 
     site = Site(root)
     reactor.listenTCP(8080, site)