diff --git a/modules/ldap/class/class_openLDAP.php b/modules/ldap/class/class_openLDAP.php
index 363dfe7ba5a38014a659f71521887aebae9c7bcb..6d129047d7bed4e8bea37a4aba2cb286c04b5c57 100755
--- a/modules/ldap/class/class_openLDAP.php
+++ b/modules/ldap/class/class_openLDAP.php
@@ -31,7 +31,7 @@ class LDAP {
 	protected $_bind;
 
 	
-	function __construct($domain,$login,$password,$ssl='false',$hostname){
+	function __construct($domain,$login,$password,$ssl='false',$hostname=null){
 		
 		$this->_domain = $domain;
 		$this->_login = $login;
@@ -284,4 +284,4 @@ class LDAP {
     
 }
 
-?>
\ No newline at end of file
+?>