diff --git a/test/test_credit_card_sale.rb b/test/test_credit_card_sale.rb
index deded1504864f8b11fac0c7405bfbe6970c4a0bc..2d460da513e4c39af7c23f5edc2776ec4c8462f8 100644
--- a/test/test_credit_card_sale.rb
+++ b/test/test_credit_card_sale.rb
@@ -4,6 +4,7 @@ require "test_helper"
 require "credit_card_sale"
 require "customer"
 require "transaction"
+require "ostruct"
 
 CreditCardSale::BRAINTREE = Minitest::Mock.new
 CreditCardSale::REDIS = Minitest::Mock.new