diff --git a/htdocs/core/class/html.form.class.php b/htdocs/core/class/html.form.class.php
index 88f7f7aaa9a..31d54797489 100644
--- a/htdocs/core/class/html.form.class.php
+++ b/htdocs/core/class/html.form.class.php
@@ -8366,7 +8366,7 @@ class Form
             </dt>
             <dd class="dropdowndd">
                 <div class="multiselectcheckbox'.$htmlname.'">
-                    <ul class="ul'.$htmlname.' '.$htmlname.$pos.'">
+                    <ul class="'.$htmlname.$pos.'">
                     '.$listoffieldsforselection.'
                     </ul>
                 </div>