diff --git a/test/index.js b/test/index.js
index bc1e7ba3..557de17c 100644
--- a/test/index.js
+++ b/test/index.js
@@ -3,6 +3,7 @@ var env = require('./support/env');
 
 // whitelist some globals to avoid warnings
 global.__eio = null;
+global.___eio = null;
 global.WEB_SOCKET_LOGGER = null;
 global.WEB_SOCKET_SUPPRESS_CROSS_DOMAIN_SWF_ERROR = null;
 global.WEB_SOCKET_DISABLE_AUTO_INITIALIZATION = null;