diff --git a/ember-cli-build.js b/ember-cli-build.js
index 4ee59df6df..9c0a3052b8 100644
--- a/ember-cli-build.js
+++ b/ember-cli-build.js
@@ -4,7 +4,10 @@ var EmberApp = require('ember-cli/lib/broccoli/ember-app');
 
 module.exports = function(defaults) {
   var app = new EmberApp(defaults, {
-    // Add options here
+    babel: {
+      optional: ['es6.spec.symbols'],
+      includePolyfill: true
+    }
   });
 
   // Use `app.import` to add additional libraries to the generated