Index: wp-includes/wp-diff.php
===================================================================
--- wp-includes/wp-diff.php	(revision 17779)
+++ wp-includes/wp-diff.php	(working copy)
@@ -69,8 +69,7 @@
 	 * @param array $params
 	 */
 	function __construct( $params = array() ) {
-		$parent = get_parent_class($this);
-		$this->$parent( $params );
+		parent::__construct( $params );
 	}
 
 	/**