diff --git a/app/mailers/spree/order_mailer.rb b/app/mailers/spree/order_mailer.rb
index 9fbed9f02b..00002715c3 100644
--- a/app/mailers/spree/order_mailer.rb
+++ b/app/mailers/spree/order_mailer.rb
@@ -2,7 +2,7 @@
 
 module Spree
   class OrderMailer < BaseMailer
-    helper ::CheckoutHelper
+    helper 'checkout'
     helper SpreeCurrencyHelper
     helper Spree::Admin::PaymentsHelper
     helper OrderHelper