diff --git a/system/libraries/Email.php b/system/libraries/Email.php
index 45c5c09..66b5803 100644
--- a/system/libraries/Email.php
+++ b/system/libraries/Email.php
@@ -405,7 +405,7 @@
 	 * @param	array	$config = array()
 	 * @return	void
 	 */
-	public function __construct($config = array())
+	public function __construct(array $config = array())
 	{
 		$this->charset = config_item('charset');