diff --git a/Config/Model/Backend/DeliveryDateOff.php b/Config/Model/Backend/DeliveryDateOff.php
index 4b0395af0..45d5659f9 100644
--- a/Config/Model/Backend/DeliveryDateOff.php
+++ b/Config/Model/Backend/DeliveryDateOff.php
@@ -85,7 +85,7 @@ protected function _afterLoad(): void
     /**
      * @return $this
      */
-    public function beforeSave(): static
+    public function beforeSave()
     {
         $value = $this->getValue();
         $date = [];