diff --git a/app/controllers/spree/checkout_controller_decorator.rb b/app/controllers/spree/checkout_controller_decorator.rb
index b5cabe2..c07f2a0 100644
--- a/app/controllers/spree/checkout_controller_decorator.rb
+++ b/app/controllers/spree/checkout_controller_decorator.rb
@@ -177,7 +177,7 @@ module Spree
     private
 
     def asset_url(_path)
-      URI::HTTP.build(:path => ActionController::Base.helpers.asset_path(_path), :host => Spree::Config[:site_url]).to_s
+      URI::HTTP.build(:path => ActionController::Base.helpers.asset_path(_path), :host => Spree::Config[:site_url].strip).to_s
     end
 
     def record_log(payment, response)