diff --git a/framework/core/js/admin/Gulpfile.js b/framework/core/js/admin/Gulpfile.js
index e921028ae..c695c9a1e 100644
--- a/framework/core/js/admin/Gulpfile.js
+++ b/framework/core/js/admin/Gulpfile.js
@@ -2,6 +2,7 @@ var gulp = require('flarum-gulp');
 
 gulp({
   files: [
+    'node_modules/babel-core/external-helpers.js',
     '../bower_components/loader.js/loader.js',
     '../bower_components/mithril/mithril.js',
     '../bower_components/jquery/dist/jquery.js',
@@ -16,5 +17,6 @@ gulp({
   ],
   bootstrapFiles: [],
   modulePrefix: 'flarum',
+  externalHelpers: true,
   outputFile: 'dist/app.js'
 });
diff --git a/framework/core/js/admin/package.json b/framework/core/js/admin/package.json
index 3e0ef919d..81fb6266e 100644
--- a/framework/core/js/admin/package.json
+++ b/framework/core/js/admin/package.json
@@ -2,6 +2,7 @@
   "private": true,
   "devDependencies": {
     "gulp": "^3.8.11",
-    "flarum-gulp": "git+https://github.com/flarum/gulp.git"
+    "flarum-gulp": "git+https://github.com/flarum/gulp.git",
+    "babel-core": "^5.0.0"
   }
 }
diff --git a/framework/core/js/forum/Gulpfile.js b/framework/core/js/forum/Gulpfile.js
index ca3d343f9..37f0b0332 100644
--- a/framework/core/js/forum/Gulpfile.js
+++ b/framework/core/js/forum/Gulpfile.js
@@ -2,6 +2,7 @@ var gulp = require('flarum-gulp');
 
 gulp({
   files: [
+    'node_modules/babel-core/external-helpers.js',
     '../bower_components/loader.js/loader.js',
     '../bower_components/mithril/mithril.js',
     '../bower_components/jquery/dist/jquery.js',
@@ -18,5 +19,6 @@ gulp({
   ],
   bootstrapFiles: [],
   modulePrefix: 'flarum',
+  externalHelpers: true,
   outputFile: 'dist/app.js'
 });
diff --git a/framework/core/js/forum/package.json b/framework/core/js/forum/package.json
index 3e0ef919d..81fb6266e 100644
--- a/framework/core/js/forum/package.json
+++ b/framework/core/js/forum/package.json
@@ -2,6 +2,7 @@
   "private": true,
   "devDependencies": {
     "gulp": "^3.8.11",
-    "flarum-gulp": "git+https://github.com/flarum/gulp.git"
+    "flarum-gulp": "git+https://github.com/flarum/gulp.git",
+    "babel-core": "^5.0.0"
   }
 }