diff --git a/lib/payu.rb b/lib/payu.rb
index 8275ddf..0e7d11a 100644
--- a/lib/payu.rb
+++ b/lib/payu.rb
@@ -9,7 +9,7 @@ def initialize(api_key, api_login, test=false, lang="es")
         @test = test
         @lang = lang
 
-        @api_uri = URI.parse("https://#{'stg.' if test}api.payulatam.com")
+        @api_uri = URI.parse("https://#{'sandbox.' if test}api.payulatam.com")
         @payments_api_url = "/payments-api/4.0/service.cgi"
         @reports_api_url = "/reports-api/4.0/service.cgi"
     end