diff --git a/gulpfile.js b/gulpfile.js
index 9c85c7933f..a213ff2868 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -30,6 +30,7 @@ var _HTLM_DEFAULT_SCRIPTS_JS = [
   {src: '/deps/traceur-runtime.js', mimeType: 'text/javascript'},
   {src: '/rtts_assert/lib/rtts_assert.js', mimeType: 'text/javascript'},
   {src: '/deps/es6-module-loader-sans-promises.src.js', mimeType: 'text/javascript'},
+  {src: '/deps/zone.js', mimeType: 'text/javascript'},
   {src: '/deps/system.src.js', mimeType: 'text/javascript'},
   {src: '/deps/extension-register.js', mimeType: 'text/javascript'},
   {src: '/deps/runtime_paths.js', mimeType: 'text/javascript'},
@@ -66,6 +67,7 @@ var CONFIG = {
       "node_modules/es6-module-loader/dist/es6-module-loader-sans-promises.src.js",
       "node_modules/systemjs/dist/system.src.js",
       "node_modules/systemjs/lib/extension-register.js",
+      "node_modules/zone.js/zone.js",
       "tools/build/runtime_paths.js",
       "node_modules/angular/angular.js"
     ]