diff --git a/app/helpers/issues_helper.rb b/app/helpers/issues_helper.rb
index db94832..f2b00cc 100644
--- a/app/helpers/issues_helper.rb
+++ b/app/helpers/issues_helper.rb
@@ -107,7 +107,7 @@ module IssuesHelper
   def render_descendants_tree(issue)
     s = '<form><table class="list issues">'
     issue_list(issue.descendants.visible.preload(:status, :priority, :tracker, :assigned_to).sort_by(&:lft)) do |child, level|
-      css = "issue issue-#{child.id} hascontextmenu #{issue.css_classes}"
+      css = "issue issue-#{child.id} hascontextmenu #{child.css_classes}"
       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') +