diff --git a/app/controllers/cache_sweeping_helper.rb b/app/controllers/cache_sweeping_helper.rb
index c7109e19..6d986b39 100644
--- a/app/controllers/cache_sweeping_helper.rb
+++ b/app/controllers/cache_sweeping_helper.rb
@@ -8,11 +8,11 @@ module CacheSweepingHelper
   end
 
   def expire_cached_summary_pages(web)
-    categories = WikiReference.all(:conditions => "link_type = 'C'")
+    categories = WikiReference.list_categories(web)
     %w(recently_revised list).each do |action|
       expire_action :controller => 'wiki', :web => web.address, :action => action
       categories.each do |category|
-        expire_action :controller => 'wiki', :web => web.address, :action => action, :category => category.referenced_name
+        expire_action :controller => 'wiki', :web => web.address, :action => action, :category => category
       end
     end