diff --git a/settings/js/users.js b/settings/js/users.js
index 18f4e9f209..90569bcc56 100644
--- a/settings/js/users.js
+++ b/settings/js/users.js
@@ -42,7 +42,9 @@ $(document).ready(function(){
}
var addGroup = function(group) {
$('select[multiple]').each(function(index, element) {
- $(element).append('');
+ if ($(element).find('option[value="'+group +'"]').length == 0) {
+ $(element).append('');
+ }
})
};
element.multiSelect({