diff --git a/app/views/forum_topics/index.html.erb b/app/views/forum_topics/index.html.erb
index 6e5ff00d8..c14969da5 100644
--- a/app/views/forum_topics/index.html.erb
+++ b/app/views/forum_topics/index.html.erb
@@ -18,7 +18,7 @@
       </thead>
       <tbody>
         <% @forum_topics.each do |topic| %>
-          <tr class="forum-topic-row">
+          <tr class="forum-topic-row forum-topic-category-<%= topic.category_id %>">
             <td>
               <% if topic.is_sticky? %>
                 <span class="sticky">Sticky:</span>