diff --git a/addons/payment/models/payment_acquirer.py b/addons/payment/models/payment_acquirer.py
index bf83f8a4126..08d79b2756c 100644
--- a/addons/payment/models/payment_acquirer.py
+++ b/addons/payment/models/payment_acquirer.py
@@ -251,7 +251,7 @@ class PaymentAcquirer(osv.Model):
         # compute fees
         fees_method_name = '%s_compute_fees' % acquirer.provider
         if hasattr(self, fees_method_name):
-            fees = getattr(self, fees_method_name)(cr, uid, id, values['amount'], values['currency_id'], values['partner_country_id'], context=None)
+            fees = getattr(self, fees_method_name)(cr, uid, id, values['amount'], values['currency_id'], values.get('partner_country_id'), context=None)
             values['fees'] = float_round(fees, 2)
 
         # call <name>_form_generate_values to update the tx dict with acqurier specific values