diff --git a/tests/Api/MailingListTest.php b/tests/Api/MailingListTest.php
index b810ce6..3786d58 100644
--- a/tests/Api/MailingListTest.php
+++ b/tests/Api/MailingListTest.php
@@ -48,6 +48,7 @@ class MailingListTest extends TestCase
             'name' => 'Foo',
             'description' => 'Description',
             'access_level' => 'readonly',
+            'reply_preference' => 'list'
         ];
 
         $api = $this->getApiMock();