diff --git a/interface/web/sites/form/web_domain.tform.php b/interface/web/sites/form/web_domain.tform.php
index f9ffa24550faab1bca6f30b9b146dbce47328c40..467376cab6824b00da7aec6d942231c0100da2ea 100644
--- a/interface/web/sites/form/web_domain.tform.php
+++ b/interface/web/sites/form/web_domain.tform.php
@@ -127,6 +127,9 @@ $form["tabs"]['domain'] = array (
 														'regex' => '/^[\w\.\-]{2,255}\.[a-zA-Z0-9\-]{2,30}$/',
 														'errmsg'=> 'domain_error_regex'),
 									),
+			'filters'	=> array ( 	0 => array (	'event'	=> 'SAVE',
+													'type'	=> 'TOLOWER'),
+									),
 			'default'	=> '',
 			'value'		=> '',
 			'width'		=> '30',