diff --git a/app/views/user_notifications/digest.html.erb b/app/views/user_notifications/digest.html.erb
index 465fd6fd53a..0323f69e2e9 100644
--- a/app/views/user_notifications/digest.html.erb
+++ b/app/views/user_notifications/digest.html.erb
@@ -36,7 +36,9 @@
 
             <span class='post-count'><%= t('user_notifications.digest.posts', count: t.posts_count) %></span>
 
-            <%- if t.category && !t.category.uncategorized? %><span style='background-color: #<%= t.category.color %>; color: #<%= t.category.text_color %>; font-size: 12px; padding: 4px 6px; font-weight: bold'><%= t.category.name %></span><%- end %>
+            <%- if t.category && !t.category.uncategorized? %>
+              <%- if t.category.parent_category %><span style='background-color: #<%= t.category.parent_category.color %>; font-size: 12px; padding: 4px 2px; font-weight: bold; margin: 0; width: 2px;'>&nbsp;</span><%- end %><span style='background-color: #<%= t.category.color %>; color: #<%= t.category.text_color %>; font-size: 12px; padding: 4px 6px; font-weight: bold; margin: 0;'><%= t.category.name %></span>
+            <%- end %>
           </li>
         </ul>
       <%- end -%>