diff --git a/lib/noosfero/api/entities.rb b/lib/noosfero/api/entities.rb
index 957f69d..de3c4d9 100644
--- a/lib/noosfero/api/entities.rb
+++ b/lib/noosfero/api/entities.rb
@@ -57,12 +57,11 @@ module Noosfero
 
       class CategoryBase < Entity
         root 'categories', 'category'
-        expose :name, :id
+        expose :name, :id, :slug
       end
 
       class Category < CategoryBase
         root 'categories', 'category'
-        expose :slug
         expose :full_name do |category, options|
           category.full_name
         end
--
libgit2 0.21.2