diff --git a/app/controllers/spree/checkout_controller_decorator.rb b/app/controllers/spree/checkout_controller_decorator.rb
index 1367a01..6b3e5cd 100644
--- a/app/controllers/spree/checkout_controller_decorator.rb
+++ b/app/controllers/spree/checkout_controller_decorator.rb
@@ -357,7 +357,7 @@ module Spree
         shipping_method = @order.shipping_method_id ? ShippingMethod.find(@order.shipping_method_id) : ShippingMethod.all.first
         shipping_default = [{ :default => true,
                               :name => shipping_method.name,
-                              :amount => ((shipping_method.calculator.compute(self).to_f) * 100).to_i }]
+                              :amount => ((shipping_method.calculator.compute(@order).to_f) * 100).to_i }]
       end
 
       {