diff --git a/lib/jsduck/tree_icons.rb b/lib/jsduck/tree_icons.rb
index 062304d62526bc83a6f159c907339ca90a511544..2aca51a70b784e3966b8a69d93bd5808d509343f 100644
--- a/lib/jsduck/tree_icons.rb
+++ b/lib/jsduck/tree_icons.rb
@@ -10,7 +10,7 @@ module JsDuck
           icons.merge!(extract_icons(child))
         end
       else
-        icons[node[:id]] = node[:iconCls]
+        icons[node[:clsName]] = node[:iconCls]
       end
       icons
     end