diff --git a/setup/inc/hook_config_validate.inc.php b/setup/inc/hook_config_validate.inc.php
index 678056cd5d..7b500a6cd5 100644
--- a/setup/inc/hook_config_validate.inc.php
+++ b/setup/inc/hook_config_validate.inc.php
@@ -148,3 +148,15 @@
 			}
 		}
 	}
+	
+	/**
+	 * Add bracket around the ldap_search_filter, if admin forgot it
+	 *
+	 * @param array $settings
+	 */
+	function ldap_search_filter(&$settings)
+	{
+		$filter =& $settings['ldap_search_filter'];
+		
+		if ($filter && $filter{0} != '(') $filter = '('.$filter.')';
+	}