diff --git a/interface/web/sites/tools.inc.php b/interface/web/sites/tools.inc.php
index 16b1c5df808d4e751a518c53b263c237dddf7f0c..1e87ef9f9073d58b62aba204f6ff4dd2f90c2f9a 100644
--- a/interface/web/sites/tools.inc.php
+++ b/interface/web/sites/tools.inc.php
@@ -105,9 +105,9 @@ function getClientID($dataRecord) {
 
 function convertClientName($name){
 	/**
-	 *  only allow 'a'..'z', '_', '0'..'9'
+	 *  only allow 'a'..'z', '_', '-', '0'..'9'
 	 */
-	$allowed = 'abcdefghijklmnopqrstuvwxyz0123456789_';
+	$allowed = 'abcdefghijklmnopqrstuvwxyz0123456789_-';
 	$res = '';
 	$name = strtolower(trim($name));
 	for ($i=0; $i < strlen($name); $i++){