diff --git a/package.json b/package.json
index 4b67aeefacb..2331bf0fe20 100644
--- a/package.json
+++ b/package.json
@@ -59,8 +59,7 @@
   },
   "scripts": {
     "test": "grunt test",
-    "coveralls": "grunt karma:coveralls && rm -rf ./coverage",
-    "postinstall": "./node_modules/.bin/grunt copy:node_modules"
+    "coveralls": "grunt karma:coveralls && rm -rf ./coverage"
   },
   "license": "Apache-2.0",
   "dependencies": {
diff --git a/tasks/build_task.js b/tasks/build_task.js
index d844b661722..3ace8514164 100644
--- a/tasks/build_task.js
+++ b/tasks/build_task.js
@@ -8,6 +8,7 @@ module.exports = function(grunt) {
     'jscs',
     'tslint',
     'clean:release',
+    'copy:node_modules',
     'copy:public_to_gen',
     'typescript:build',
     'karma:test',
diff --git a/tasks/default_task.js b/tasks/default_task.js
index 7877fc2a34b..033acb3921e 100644
--- a/tasks/default_task.js
+++ b/tasks/default_task.js
@@ -8,6 +8,7 @@ module.exports = function(grunt) {
     'jshint',
     'tslint',
     'clean:gen',
+    'copy:node_modules',
     'copy:public_to_gen',
     'phantomjs',
     'css',