diff --git a/app/views/issues/_edit.html.erb b/app/views/issues/_edit.html.erb
index d816ff6fc..219122d25 100644
--- a/app/views/issues/_edit.html.erb
+++ b/app/views/issues/_edit.html.erb
@@ -43,6 +43,10 @@
       <%= call_hook(:view_issues_edit_notes_bottom, { :issue => @issue, :notes => @notes, :form => f }) %>
       </fieldset>
     <% end %>
+    <% 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 %>
     <% if @issue.attachments_addable? %>
       <fieldset id="add_attachments"><legend><%= l(:label_attachment_plural) %></legend>
         <% if @issue.attachments.any? && @issue.safe_attribute?('deleted_attachment_ids') %>
diff --git a/test/system/inline_autocomplete_test.rb b/test/system/inline_autocomplete_test.rb
index ea7723163..db63c953b 100644
--- a/test/system/inline_autocomplete_test.rb
+++ b/test/system/inline_autocomplete_test.rb
@@ -218,4 +218,23 @@ class InlineAutocompleteSystemTest < ApplicationSystemTestCase
 
     assert_equal '@dlopper ', find('#notes').value
   end
+
+  def test_inline_autocomplete_for_users_on_issues_without_edit_issue_permission
+    role_developer = Role.find(2)
+    role_developer.remove_permission!(:edit_issues)
+    role_developer.add_permission!(:add_issue_watchers)
+
+    log_user('jsmith', 'jsmith')
+    visit '/issues/4/edit'
+
+    find('#issue_notes').click
+    fill_in 'issue[notes]', :with => '@'
+
+    within('.tribute-container') do
+      assert page.has_text? 'John Smith'
+      first('li').click
+    end
+
+    assert_equal '@jsmith ', find('#issue_notes').value
+  end
 end