diff --git a/app/models/spree/gateway/pay_pal_express_decorator.rb b/app/models/spree/gateway/pay_pal_express_decorator.rb
index dc8239a107..f83151e617 100644
--- a/app/models/spree/gateway/pay_pal_express_decorator.rb
+++ b/app/models/spree/gateway/pay_pal_express_decorator.rb
@@ -1,3 +1,5 @@
+require_relative '../gateway_decorator'
+
 module Spree
   class Gateway::PayPalExpress < Gateway
     # Something odd is happening with class inheritance here, this class (defined in spree_paypal_express gem)