diff --git a/lib/active_admin/resource.rb b/lib/active_admin/resource.rb
index 92671e58fda..251f9bd6eb8 100644
--- a/lib/active_admin/resource.rb
+++ b/lib/active_admin/resource.rb
@@ -133,7 +133,6 @@ def csv_builder
 
     def default_options
       {
-        :namespace  => ActiveAdmin.application.default_namespace,
         :sort_order => "#{resource.respond_to?(:primary_key) ? resource.primary_key : 'id'}_desc"
       }
     end