diff --git a/htdocs/install/fileconf.php b/htdocs/install/fileconf.php
index b9cacb692f1..aedcf8307f3 100644
--- a/htdocs/install/fileconf.php
+++ b/htdocs/install/fileconf.php
@@ -4,6 +4,7 @@
  * Copyright (C) 2004-2010 Laurent Destailleur  <eldy@users.sourceforge.net>
  * Copyright (C) 2004      Benoit Mortier       <benoit.mortier@opensides.be>
  * Copyright (C) 2004      Sebastien DiCintio   <sdicintio@ressource-toi.org>
+ * Copyright (C) 2005-2010 Regis Houssin        <regis@dolibarr.fr>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -393,7 +394,7 @@ while (($file = readdir($handle))!==false)
 <script type="text/javascript" language="javascript">
 
 function checkDatabaseName(databasename) {
-	if (databasename.match(/[-;_\.]/)) { return false; }
+	if (databasename.match(/[-;\.]/)) { return false; }
 	return true;
 }