diff --git a/eopayment/paybox.py b/eopayment/paybox.py
index a00dd59..0962f23 100644
--- a/eopayment/paybox.py
+++ b/eopayment/paybox.py
@@ -200,8 +200,11 @@ class Payment(PaymentCommon):
                 'name': 'platform',
                 'caption': _('Plateforme cible'),
                 'default': 'test',
-                'validation': lambda x: isinstance(x, six.string_types)
-                and x.lower() in ('test', 'prod'),
+                'choices': (
+                    ('test', 'Test'),
+                    ('backup', 'Backup'),
+                    ('prod', 'Production'),
+                )
             },
             {
                 'name': 'site',