diff --git a/app/views/rubriken/show.html.erb b/app/views/rubriken/show.html.erb
index b0ae16d..c5ff9b6 100755
--- a/app/views/rubriken/show.html.erb
+++ b/app/views/rubriken/show.html.erb
@@ -46,7 +46,8 @@
 </div>
 </div>
 <div class="span3">
-<% cache("calendar_" + @calentries.pluck(:id).join('') + @calentries.order(:updated_at).reverse_order.pluck(:updated_at).first.to_i.to_s) do %>
+
+<% cache("calendar_" + @calentries.map{|c| c.id}.join('') + @calentries.max{|c|c.updated_at}.updated_at.to_i.to_s) do %>
 <%= render 'calendars/calentries', :object=>@calentries %>
 <% end %>
 <%= link_to "ics-format", calendar_path(@rubrik.calendar,:format=>:ics) %>
diff --git a/app/views/themes/blue1/home/index.html.erb b/app/views/themes/blue1/home/index.html.erb
index 5a1c534..ad7be14 100644
--- a/app/views/themes/blue1/home/index.html.erb
+++ b/app/views/themes/blue1/home/index.html.erb
@@ -56,7 +56,7 @@
   </ul>
 </div>
 <div class="span3">
-<% cache("calendar_" + @calentries.pluck(:id).join('') + @calentries.order(:updated_at).reverse_order.pluck(:updated_at).first.to_i.to_s) do %>
+<% cache("calendar_" + @calentries.map{|c| c.id}.join('') + @calentries.max{|c|c.updated_at}.updated_at.to_i.to_s) do %>
 <%= render 'calendars/calentries', :object=>@calentries %>
 <% end %>