diff --git a/src/Api/Request/CourierShipments.php b/src/Api/Request/CourierShipments.php
index 5ac7ade..44525b7 100644
--- a/src/Api/Request/CourierShipments.php
+++ b/src/Api/Request/CourierShipments.php
@@ -49,7 +49,7 @@ public function getCourierFields(string $courierCode): Response
         );
     }
 
-    public function getCourierServices(string $courierCode, int $orderId, array $fields, array $packages, ?int $accountId = null): Response
+    public function getCourierServices(string $courierCode, int $orderId, array $packages, array $fields = [], ?int $accountId = null): Response
     {
         return new Response(
             $this->post('getCourierServices', [