diff --git a/extensions/jui/Extension.php b/extensions/jui/Extension.php
deleted file mode 100644
index 4b680ce..0000000
--- a/extensions/jui/Extension.php
+++ /dev/null
@@ -1,27 +0,0 @@
-<?php
-/**
- * @link http://www.yiiframework.com/
- * @copyright Copyright (c) 2008 Yii Software LLC
- * @license http://www.yiiframework.com/license/
- */
-
-namespace yii\jui;
-
-use Yii;
-
-/**
- * This is the bootstrap class for the Yii JUI extension.
- *
- * @author Qiang Xue <qiang.xue@gmail.com>
- * @since 2.0
- */
-class Extension extends \yii\base\Extension
-{
-	/**
-	 * @inheritdoc
-	 */
-	public static function init()
-	{
-		Yii::setAlias('@yii/jui', __DIR__);
-	}
-}
diff --git a/extensions/jui/composer.json b/extensions/jui/composer.json
index 89987db..0888ab1 100644
--- a/extensions/jui/composer.json
+++ b/extensions/jui/composer.json
@@ -18,8 +18,5 @@
 	"autoload": {
 		"psr-0": { "yii\\jui\\": "" }
 	},
-	"target-dir": "yii/jui",
-	"extra": {
-		"bootstrap": "yii\\jui\\Extension"
-	}
+	"target-dir": "yii/jui"
 }