diff --git a/eopayment/paybox.py b/eopayment/paybox.py
index 2fc4bb7..90931db 100644
--- a/eopayment/paybox.py
+++ b/eopayment/paybox.py
@@ -263,7 +263,7 @@ class Payment(PaymentCommon):
                 'caption': _('Capture Mode'),
                 'default': 'IMMEDIATE',
                 'required': False,
-                'choices': PAYMENT_MODES.keys()
+                'choices': list(PAYMENT_MODES)
             },
             {
                 'name': 'manual_validation',