diff --git a/src/Model/Behavior/OrderlyBehavior.php b/src/Model/Behavior/OrderlyBehavior.php
index 86ee765..d9c6b96 100644
--- a/src/Model/Behavior/OrderlyBehavior.php
+++ b/src/Model/Behavior/OrderlyBehavior.php
@@ -55,7 +55,7 @@ public function beforeFind(EventInterface $event, Query $query, ArrayObject $opt
      * @param array $orders Orders config
      * @return void
      */
-    protected function _normalizeConfig(array $orders)
+    protected function _normalizeConfig(array $orders): void
     {
         if (empty($orders)) {
             $orders = [[]];