diff --git a/src/Control/LocaleAdmin.php b/src/Control/LocaleAdmin.php
index 1b381d20..a0ddbc95 100644
--- a/src/Control/LocaleAdmin.php
+++ b/src/Control/LocaleAdmin.php
@@ -53,7 +53,7 @@ public function getEditForm($id = null, $fields = null)
         return $form;
     }
 
-    public function getClientConfig()
+    public function getClientConfig(): array
     {
         /** @var Member|FluentMemberExtension $member */
         $member = Security::getCurrentUser();