diff --git a/app/views/issues/_edit.html.erb b/app/views/issues/_edit.html.erb
index d816ff6fc..fe12ea4a7 100644
--- a/app/views/issues/_edit.html.erb
+++ b/app/views/issues/_edit.html.erb
@@ -42,6 +42,10 @@
 
       <%= call_hook(:view_issues_edit_notes_bottom, { :issue => @issue, :notes => @notes, :form => f }) %>
       </fieldset>
+      <% if !@issue.attributes_editable? && User.current.allowed_to?(:add_issue_watchers, @issue.project) %>
+        <%= update_data_sources_for_auto_complete({users: watchers_autocomplete_for_mention_path(project_id: @issue.project, q: '', object_type: 'issue',
+        object_id: @issue.id)}) %>
+      <% end %>
     <% end %>
     <% if @issue.attachments_addable? %>
       <fieldset id="add_attachments"><legend><%= l(:label_attachment_plural) %></legend>