diff --git a/inc/auth.inc.php b/inc/auth.inc.php
index 0be1aaf70..20cb982cb 100644
--- a/inc/auth.inc.php
+++ b/inc/auth.inc.php
@@ -87,6 +87,7 @@ function LDAPAuthenticate() {
     global $ldap_bindpw;
     global $ldap_proto;
     global $ldap_user_attribute;
+    global $syslog_use, $syslog_ident, $syslog_facility;
 
     if (isset($_SESSION["userlogin"]) && isset($_SESSION["userpwd"])) {
         if ($ldap_debug) {