diff --git a/lib/connect/wx.js b/lib/connect/wx.js
index c5048b5b7..4cb32454c 100644
--- a/lib/connect/wx.js
+++ b/lib/connect/wx.js
@@ -99,7 +99,7 @@ function buildStream (client, opts) {
   var url = buildUrl(opts, client)
   socketTask = wx.connectSocket({
     url: url,
-    protocols: websocketSubProtocol
+    protocols: [websocketSubProtocol]
   })
 
   proxy = buildProxy()