diff --git a/app/documents/order_by_groups.rb b/app/documents/order_by_groups.rb
index e71aa8fc..7eb570e2 100644
--- a/app/documents/order_by_groups.rb
+++ b/app/documents/order_by_groups.rb
@@ -86,7 +86,7 @@ class OrderByGroups < OrderPdf
 
   def group_orders
     order.group_orders.ordered.
-      joins(:ordergroup).order('groups.name').
+      includes(:ordergroup).order('groups.name').
       preload(:group_order_articles => {:order_article => [:article, :article_price]})
   end