diff --git a/e107_handlers/user_handler.php b/e107_handlers/user_handler.php
index 9eec3d4af..16aab8e6e 100644
--- a/e107_handlers/user_handler.php
+++ b/e107_handlers/user_handler.php
@@ -89,7 +89,7 @@ class UserHandler
 */
 	$this->userVettingInfo = array(
 		'user_name' => array('niceName'=> LAN_USER_01, 'fieldType' => 'string', 'vetMethod' => '1,2', 'vetParam' => 'signup_disallow_text', 'srcName' => 'username', 'stripTags' => TRUE, 'stripChars' => '/ |\#|\=|\$/', fixedBlock => 'anonymous', 'minLength' => 2, 'maxLength' => varset($pref['displayname_maxlength'],15)),				// Display name
-		'user_loginname' => array('niceName'=> LAN_USER_02, 'fieldType' => 'string', 'vetMethod' => '1', 'vetParam' => '', 'srcName' => 'loginname', 'stripTags' => TRUE, 'stripChars' => '%*|/| |\#|\=|\$%', 'minLength' => 2, 'maxLength' => varset($pref['loginname_maxlength'],30)),			// User name
+		'user_loginname' => array('niceName'=> LAN_USER_02, 'fieldType' => 'string', 'vetMethod' => '1', 'vetParam' => '', 'srcName' => 'loginname', 'stripTags' => TRUE, 'stripChars' => '#[^a-z0-9_\.]#i', 'minLength' => 2, 'maxLength' => varset($pref['loginname_maxlength'],30)),			// User name
 		'user_login' => array('niceName'=> LAN_USER_03, 'fieldType' => 'string', 'vetMethod' => '0', 'vetParam' => '', 'srcName' => 'realname', 'dbClean' => 'toDB'),				// Real name (no real vetting)
 		'user_customtitle' => array('niceName'=> LAN_USER_04, 'fieldType' => 'string', 'vetMethod' => '0', 'vetParam' => '', 'srcName' => 'customtitle', 'dbClean' => 'toDB', 'enablePref' => 'signup_option_customtitle'),		// No real vetting
 		'user_password' => array('niceName'=> LAN_USER_05, 'fieldType' => 'string', 'vetMethod' => '0', 'vetParam' => '', 'srcName' => 'password1', 'dataType' => 2, 'minLength' => varset($pref['signup_pass_len'],1)),