diff --git a/lib/ontologies_linked_data/models/group.rb b/lib/ontologies_linked_data/models/group.rb
index 73ee8fd8..d37d13fe 100644
--- a/lib/ontologies_linked_data/models/group.rb
+++ b/lib/ontologies_linked_data/models/group.rb
@@ -8,7 +8,9 @@ class Group < LinkedData::Models::Base
       attribute :created, enforce: [:date_time], :default => lambda { |record| DateTime.now }
       attribute :ontologies, inverse: { on: :ontology, attribute: :group }
 
+      serialize_default :acronym, :name, :description, :created, :ontologies
+
       cache_timeout 86400
     end
   end
-end
\ No newline at end of file
+end