diff --git a/Document/Subscriber/RoutableSubscriber.php b/Document/Subscriber/RoutableSubscriber.php
index 3e5b6a2a..6a976506 100644
--- a/Document/Subscriber/RoutableSubscriber.php
+++ b/Document/Subscriber/RoutableSubscriber.php
@@ -310,7 +310,7 @@ private function updateRoute(RoutablePageBehavior $document): void
 
         $node = $this->documentInspector->getNode($document);
         $node->setProperty($propertyName, $route->getPath());
-        $node->setProperty($this->propertyEncoder->localizedContentName(self::ROUTE_FIELD_NAME, $locale), $propertyName);
+        $node->setProperty($this->propertyEncoder->localizedContentName(self::ROUTE_FIELD_NAME, (string) $locale), $propertyName);
     }
 
     private function updateChildRoutes(ChildrenBehavior $document): void