diff --git a/protected/humhub/modules/ldap/models/LdapSettings.php b/protected/humhub/modules/ldap/models/LdapSettings.php
index e6402e8b3..3b653d590 100644
--- a/protected/humhub/modules/ldap/models/LdapSettings.php
+++ b/protected/humhub/modules/ldap/models/LdapSettings.php
@@ -125,7 +125,7 @@ class LdapSettings extends Model
         return [
             [['enabled', 'refreshUsers', 'usernameAttribute', 'emailAttribute', 'username', 'passwordField', 'hostname', 'port', 'idAttribute'], 'string', 'max' => 255],
             [['baseDn', 'loginFilter', 'userFilter', 'ignoredDNs'], 'string'],
-            [['usernameAttribute', 'username', 'passwordField', 'hostname', 'port', 'baseDn', 'loginFilter', 'userFilter', 'idAttribute'], 'required'],
+            [['usernameAttribute', 'hostname', 'port', 'baseDn', 'loginFilter', 'userFilter', 'idAttribute'], 'required'],
             ['encryption', 'in', 'range' => ['', 'ssl', 'tls']],
         ];
     }