diff --git a/includes/class.options.php b/includes/class.options.php
index f481ab3..f862f92 100644
--- a/includes/class.options.php
+++ b/includes/class.options.php
@@ -498,7 +498,7 @@ function get_key() {
 	function &add( $id, $properties = array(), $update = false ) {
 		// Create item
 		$args = func_get_args();
-		$ret  = call_user_func_array( array( 'parent', 'add' ), $args );
+		$ret  = call_user_func_array( array( parent::class, 'add' ), $args );
 		return $ret;
 	}