diff --git a/interface/lib/classes/remote.d/mail.inc.php b/interface/lib/classes/remote.d/mail.inc.php
index 75c2165298a744f2989271e6cbf686f5aa7092d0..bda7e861ed429f1c9c985c3dcf6d180aef843281 100644
--- a/interface/lib/classes/remote.d/mail.inc.php
+++ b/interface/lib/classes/remote.d/mail.inc.php
@@ -217,6 +217,7 @@ class remoting_mail extends remoting {
 		//* Set a few params to non empty values that will be overwritten by mail_plugin
 		if (!isset($params['uid'])) $params['uid'] = -1;
 		if (!isset($params['gid'])) $params['gid'] = -1;
+		if (!isset($params['maildir_format'])) $params['maildir_format'] = 'maildir';
 
 		$affected_rows = $this->insertQuery('../mail/form/mail_user.tform.php', $client_id, $params);
 		return $affected_rows;