diff --git a/lib/ontologies_linked_data/models/category.rb b/lib/ontologies_linked_data/models/category.rb
index a92b8a96..ba585fe8 100644
--- a/lib/ontologies_linked_data/models/category.rb
+++ b/lib/ontologies_linked_data/models/category.rb
@@ -9,6 +9,7 @@ class Category < LinkedData::Models::Base
       attribute :parentCategory, enforce: [:category, :list]
       attribute :ontologies, inverse: { on: :ontology, attribute: :hasDomain }
 
+      serialize_default :acronym, :name, :description, :created, :parentCategory, :ontologies
       cache_timeout 86400
     end
   end