diff --git a/CRM/Mailing/Event/BAO/Unsubscribe.php b/CRM/Mailing/Event/BAO/Unsubscribe.php
index 4e6b216d91ea..ecc2b5e3da0e 100644
--- a/CRM/Mailing/Event/BAO/Unsubscribe.php
+++ b/CRM/Mailing/Event/BAO/Unsubscribe.php
@@ -293,9 +293,9 @@ public static function unsub_from_mailing($job_id, $queue_id, $hash, $return = F
    * Send a response email informing the contact of the groups from which he.
    * has been unsubscribed.
    *
-   * @param string $queue_id
+   * @param int $queue_id
    *   The queue event ID.
-   * @param array $groups
+   * @param array|null $groups
    *   List of group IDs.
    * @param bool $is_domain
    *   Is this domain-level?.