diff --git a/app/views/admin/archive_files/_form_file.html.erb b/app/views/admin/archive_files/_form_file.html.erb
index ffe4aa1..62690a8 100644
--- a/app/views/admin/archive_files/_form_file.html.erb
+++ b/app/views/admin/archive_files/_form_file.html.erb
@@ -43,7 +43,7 @@
         </li>
         <% end %>
       </ul>
-      <%= hidden_field_tag "archive_file[archive_file_multiples_attributes][#{i}][choose_lang][]", '' %>
+      <%= hidden_field_tag "archive_file[archive_file_multiples_attributes][#{( form_file.new_record? ? 'new_archive_file_multiples' : "#{i}" )}][choose_lang][]", '' %>
     </span>
 
     <% if form_file.new_record? %>