diff --git a/lib/Horde/Ldap/Filter.php b/lib/Horde/Ldap/Filter.php
index a8747c5..0a2e741 100644
--- a/lib/Horde/Ldap/Filter.php
+++ b/lib/Horde/Ldap/Filter.php
@@ -288,11 +288,12 @@ public static function build(array $params, $operator = 'and')
             return self::parse($params['filter']);
         }
         if (!is_array($params['objectclass'])) {
-            return self::create('objectclass', 'equals', $params['objectclass']);
+            // Do not escape values from admin configuration (e.g., '*')
+            return self::create('objectclass', 'equals', $params['objectclass'], false);
         }
         $filters = [];
         foreach ($params['objectclass'] as $objectclass) {
-            $filters[] = self::create('objectclass', 'equals', $objectclass);
+            $filters[] = self::create('objectclass', 'equals', $objectclass, false);
         }
         if (count($filters) == 1) {
             return $filters[0];