diff --git a/lib/ajax-datatables-rails/base.rb b/lib/ajax-datatables-rails/base.rb
index 080fe0c1..9832752c 100644
--- a/lib/ajax-datatables-rails/base.rb
+++ b/lib/ajax-datatables-rails/base.rb
@@ -179,7 +179,7 @@ def deprecated_sort_column(item)
     end
 
     def new_sort_column(item)
-      model, column = sortable_columns[sortable_displayed_columns.index(item[:column])].split('.')
+      model, column = sortable_columns[item[:column].to_i].split('.')
       col = [model.constantize.table_name, column].join('.')
     end