diff --git a/app/views/users/_user_activities.html.erb b/app/views/users/_user_activities.html.erb
index 63ae98280..26090d104 100644
--- a/app/views/users/_user_activities.html.erb
+++ b/app/views/users/_user_activities.html.erb
@@ -68,7 +68,7 @@
                             <%= render :partial => 'course_homework', :locals => {:activity => act,:user_activity_id =>user_activity.id,:course_activity => 0} %>
                             <% end %>
                         <% when 'News' %>
-                        <% cache [act.id, act.comments.count] do %>
+                        <% cache [act, act.comments.count] do %>
                             <%= render :partial => 'course_news', :locals => {:activity => act,:user_activity_id =>user_activity.id} %>
                         <% end %>
                         <% when 'Message'%>
@@ -83,7 +83,7 @@
                     <% when 'Project' %>
                         <% case user_activity.act_type.to_s %>
                         <% when 'Issue' %>
-                        <% cache [act.id, act.journals.count, act.attachments.count] do%>
+                        <% cache [act, act.journals.count, act.attachments.count] do%>
                             <%= render :partial => 'project_issue', :locals => {:activity => act,:user_activity_id =>user_activity.id, :user_id => user_id} %>
                         <% end %>
                         <% when 'Message' %>