diff --git a/lib/6to5/browserify.js b/lib/6to5/browserify.js
index 4f179828c6..4ffcfa28ad 100644
--- a/lib/6to5/browserify.js
+++ b/lib/6to5/browserify.js
@@ -1,5 +1,6 @@
 var transform = require("./transform");
 var through   = require("through");
+var _ = require("lodash");
 
 var browserify = module.exports = function (filename) {
   return browserify.configure()(filename);