diff --git a/app/services/checkout/form_data_adapter.rb b/app/services/checkout/form_data_adapter.rb
index 58b4924659..8fc10fc4ca 100644
--- a/app/services/checkout/form_data_adapter.rb
+++ b/app/services/checkout/form_data_adapter.rb
@@ -6,7 +6,7 @@ module Checkout
     attr_reader :shipping_method_id
 
     def initialize(params, order, current_user)
-      @params = params
+      @params = params.dup
       @order = order
       @current_user = current_user