diff --git a/src/ldapserver.js b/src/ldapserver.js
index ffe52e797..acf93abbe 100644
--- a/src/ldapserver.js
+++ b/src/ldapserver.js
@@ -460,7 +460,7 @@ async function verifyMailboxPassword(mailbox, password) {
     if (mailbox.ownerType === mail.OWNERTYPE_USER) {
         return await users.verify(mailbox.ownerId, password, users.AP_MAIL /* identifier */, { skipTotpCheck: true });
     } else if (mailbox.ownerType === mail.OWNERTYPE_GROUP) {
-        const userIds = await groups.getMembers(mailbox.ownerId);
+        const userIds = await groups.getMemberIds(mailbox.ownerId);
 
         let verifiedUser = null;
         for (const userId of userIds) {