diff --git a/src/includes/class/class.LSattr_html_select_list.php b/src/includes/class/class.LSattr_html_select_list.php
index 60db29e7..e42987b1 100644
--- a/src/includes/class/class.LSattr_html_select_list.php
+++ b/src/includes/class/class.LSattr_html_select_list.php
@@ -193,14 +193,16 @@ class LSattr_html_select_list extends LSattr_html{
    **/
   protected static function _sortTwoValuesAsc(&$va,&$vb) {
     if (is_array($va)) {
-      $nva=$va['label'];
+      // Force sub-options at the end
+      $nva='ZZZZ'.$va['label'];
     }
     else {
       $nva=$va;
     }
 
     if (is_array($vb)) {
-      $nvb=$vb['label'];
+      // Force sub-options at the end
+      $nvb='ZZZZ'.$vb['label'];
     }
     else {
       $nvb=$vb;