diff --git a/app/sweepers/category_sweeper.rb b/app/sweepers/category_sweeper.rb
index 92a0491..4a69b76 100644
--- a/app/sweepers/category_sweeper.rb
+++ b/app/sweepers/category_sweeper.rb
@@ -3,7 +3,7 @@ class CategorySweeper < ActiveRecord::Observer
   include SweeperHelper
 
   def after_save(category)
-    expire_fragment(category.environment.name + "_categories_menu")
+    expire_fragment(category.environment.id.to_s + "_categories_menu")
   end
 
 end
diff --git a/app/views/layouts/application.rhtml b/app/views/layouts/application.rhtml
index fadbc7c..23ac645 100644
--- a/app/views/layouts/application.rhtml
+++ b/app/views/layouts/application.rhtml
@@ -87,7 +87,7 @@
                         :id=>"menu_link_to_envhome",
                         :title=>@environment.name  %>
           <% unless environment.enabled?(:disable_categories) %>
-            <% cache(environment.name +  '_categories_menu') do %>
+            <% cache(environment.name.id.to_s +  '_categories_menu') do %>
               <%= render :file => 'shared/categories_menu' %>
             <% end %>
           <% end %>
--
libgit2 0.21.2