diff --git a/htdocs/core/class/html.form.class.php b/htdocs/core/class/html.form.class.php
index a86a3b939a2..31ca42a576a 100644
--- a/htdocs/core/class/html.form.class.php
+++ b/htdocs/core/class/html.form.class.php
@@ -4231,6 +4231,10 @@ class Form
 		}
 
         $out.= '</select>';
+		// Make select dynamic
+		include_once DOL_DOCUMENT_ROOT . '/core/lib/ajax.lib.php';
+		$out.= ajax_combobox($htmlname);
+		
         return $out;
     }