diff --git a/Step/Type/PaymentStepType.php b/Step/Type/PaymentStepType.php
index 8a4fb55..580a837 100644
--- a/Step/Type/PaymentStepType.php
+++ b/Step/Type/PaymentStepType.php
@@ -19,7 +19,7 @@ public function buildNavigationStepForm(FormBuilderInterface $builder, array $op
         return;
     }
 
-    public function prepareNavigation(NavigatorInterface $navigator, array $options)
+    public function prepareNavigation(NavigatorInterface $navigator, array $options): array
     {
         if (!$navigator->getRequest()->query->has('transaction_id')) {
             $options['prevent_next'] = true;