diff --git a/src/babel/build-helpers.js b/src/babel/build-helpers.js
index c8b6468ece..f502d3fa40 100644
--- a/src/babel/build-helpers.js
+++ b/src/babel/build-helpers.js
@@ -5,7 +5,7 @@ var t    = require("./types");
 
 module.exports = function (body, namespace, whitelist = []) {
   each(File.helpers, function (name) {
-    if (whitelist.length && whitelist.indexOf(key) >= 0) return;
+    if (whitelist.length && whitelist.indexOf(name) == -1) return;
 
     var key = t.identifier(t.toIdentifier(name));
     body.push(t.expressionStatement(