diff --git a/gruntfile.js b/gruntfile.js
index 8113ed4..4f16804 100644
--- a/gruntfile.js
+++ b/gruntfile.js
@@ -57,7 +57,6 @@ module.exports = function(grunt) {
         dest: "./dist/filer.js",
         options: {
           browserifyOptions: {
-            builtins: false,
             commondir: false
           },
           bundleOptions: {