diff --git a/app.js b/app.js
index 1846b0f..7421cee 100644
--- a/app.js
+++ b/app.js
@@ -68,7 +68,7 @@ const options = {
 
 // const httpsServer = https.createServer(options, app);
 // const io = new Server(httpsServer, { allowEIO3: true });
-const server = https.createServer(app);
+const httpsServer = https.createServer(app);
 const io = require('socket.io')(server, options);
 // const io = new Server(server, { origins: '*:*', allowEIO3: true });