diff --git a/src/index.js b/src/index.js
index 502eedd..2bd533c 100755
--- a/src/index.js
+++ b/src/index.js
@@ -47,7 +47,7 @@ if (SERVER_MODE !== 'static') {
         cors: {
             origin: '*',
             methods: ['GET', 'POST'],
-            transports: ['websocket', 'polling', 'flashsocket'],
+            transports: ['websocket'],
             credentials: false
         }
     });