diff --git a/app/helpers/issues_helper.rb b/app/helpers/issues_helper.rb
index 2cc387ff8..a4213c6be 100644
--- a/app/helpers/issues_helper.rb
+++ b/app/helpers/issues_helper.rb
@@ -80,13 +80,15 @@ module IssuesHelper
   def render_descendants_tree(issue)
     s = '<form><table class="list issues">'
     issue_list(issue.descendants.visible.sort_by(&:lft)) do |child, level|
+      css = "issue issue-#{child.id} hascontextmenu"
+      css << " idnt idnt-#{level}" if level > 0
       s << content_tag('tr',
              content_tag('td', check_box_tag("ids[]", child.id, false, :id => nil), :class => 'checkbox') +
              content_tag('td', link_to_issue(child, :truncate => 60, :project => (issue.project_id != child.project_id)), :class => 'subject') +
              content_tag('td', h(child.status)) +
              content_tag('td', link_to_user(child.assigned_to)) +
              content_tag('td', progress_bar(child.done_ratio, :width => '80px')),
-             :class => "issue issue-#{child.id} hascontextmenu #{level > 0 ? "idnt idnt-#{level}" : nil}")
+             :class => css)
     end
     s << '</table></form>'
     s.html_safe