diff --git a/Gruntfile.js b/Gruntfile.js
index e66f2c74d6..92feec5638 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -80,7 +80,7 @@ module.exports = function(grunt) {
 	}
 
 	// First do `npm install` if package.json has changed.
-//	installChanged.watchPackage();
+	installChanged.watchPackage();
 
 	// Load tasks.
 	require('matchdep').filterDev(['grunt-*', '!grunt-legacy-util']).forEach( grunt.loadNpmTasks );