diff --git a/app/models/spree/order_contents.rb b/app/models/spree/order_contents.rb
index d0478256e6..024038ffec 100644
--- a/app/models/spree/order_contents.rb
+++ b/app/models/spree/order_contents.rb
@@ -13,6 +13,7 @@ module Spree
     def add(variant, quantity = 1, shipment = nil)
       line_item = order.find_line_item_by_variant(variant)
       add_to_line_item(line_item, variant, quantity, shipment)
+      shipment.present? ? shipment.update_amounts : order.ensure_updated_shipments
       update_order
     end
 
@@ -26,6 +27,7 @@ module Spree
       end
 
       remove_from_line_item(line_item, variant, quantity, shipment)
+      shipment.present? ? shipment.update_amounts : order.ensure_updated_shipments
       update_order
     end