diff --git a/Civi/Mailinglistsync/BaseMailingList.php b/Civi/Mailinglistsync/BaseMailingList.php
index c928635..a5b3a15 100644
--- a/Civi/Mailinglistsync/BaseMailingList.php
+++ b/Civi/Mailinglistsync/BaseMailingList.php
@@ -95,7 +95,7 @@ abstract class BaseMailingList
    */
   static protected function getCustomFields(): array
   {
-    return CustomField::get()
+    return CustomField::get(FALSE)
       ->addSelect('*')
       ->addWhere('custom_group_id:name', '=', static::CUSTOM_GROUP_NAME)
       ->execute()