diff --git a/src/ldapserver.js b/src/ldapserver.js
index ed6d27c0e..88262b717 100644
--- a/src/ldapserver.js
+++ b/src/ldapserver.js
@@ -340,7 +340,7 @@ async function mailboxSearch(req, res, next) {
             const lowerCaseFilter = safe(function () { return ldap.parseFilter(req.filter.toString().toLowerCase()); }, null);
             if (!lowerCaseFilter) return next(new ldap.OperationsError(safe.error.message));
 
-            if ((req.dn.equals(dn) || req.dn.parentOf(dn)) && lowerCaseFilter.matches(obj.attributes)) {
+            if ((req.dn.equals(mailboxDn) || req.dn.parentOf(mailboxDn)) && lowerCaseFilter.matches(obj.attributes)) {
                 results.push(obj);
             }
         }