diff --git a/tools/broccoli/trees/node_tree.ts b/tools/broccoli/trees/node_tree.ts
index a2539edb34..e3fc033581 100644
--- a/tools/broccoli/trees/node_tree.ts
+++ b/tools/broccoli/trees/node_tree.ts
@@ -21,11 +21,9 @@ module.exports = function makeNodeTree(destinationPath) {
   var modulesTree = new Funnel('modules', {
     include: ['angular2/**', 'benchpress/**', 'rtts_assert/**', '**/e2e_test/**'],
     exclude: [
+      // the following code and tests are not compatible with CJS/node environment
       'angular2/src/core/zone/vm_turn_zone.es6',
-      'angular2/test/core/application_spec.js',
-      'angular2/test/core/testability/**',
       'angular2/test/core/zone/**',
-      'angular2/test/render/**',
       'angular2/test/forms/integration_spec.js'
     ]
   });