diff --git a/webui/js/websocket.js b/webui/js/websocket.js
index ccebd9f..b3296a5 100644
--- a/webui/js/websocket.js
+++ b/webui/js/websocket.js
@@ -22,7 +22,7 @@ function websocketOnOpen (evt) {
 
   const foo = '{}'
 
-  ws.send(foo)
+  window.ws.send(foo)
 }
 
 function websocketOnMessage (msg) {