diff --git a/lib/ontologies_linked_data/models/category.rb b/lib/ontologies_linked_data/models/category.rb
index 09b10f87..a92b8a96 100644
--- a/lib/ontologies_linked_data/models/category.rb
+++ b/lib/ontologies_linked_data/models/category.rb
@@ -6,10 +6,10 @@ class Category < LinkedData::Models::Base
       attribute :name, enforce: [:existence]
       attribute :description
       attribute :created, enforce: [:date_time], default: lambda { |record| DateTime.now }
-      attribute :parentCategory, enforce: [:category]
+      attribute :parentCategory, enforce: [:category, :list]
       attribute :ontologies, inverse: { on: :ontology, attribute: :hasDomain }
 
       cache_timeout 86400
     end
   end
-end
\ No newline at end of file
+end