diff --git a/plugins/c9.vfs.client/vfs_test.js b/plugins/c9.vfs.client/vfs_test.js
index b9de9782..66c90836 100644
--- a/plugins/c9.vfs.client/vfs_test.js
+++ b/plugins/c9.vfs.client/vfs_test.js
@@ -1,5 +1,6 @@
 /*global describe it before beforeEach*/
 
+"use blacklist";
 "use client";
 
 require(["lib/architect/architect", "lib/chai/chai"], function (architect, chai) {