diff --git a/eopayment/ogone.py b/eopayment/ogone.py
index e7c4569..1c43e25 100644
--- a/eopayment/ogone.py
+++ b/eopayment/ogone.py
@@ -6,7 +6,7 @@ from decimal import Decimal, ROUND_HALF_UP
 
 from common import (PaymentCommon, PaymentResponse, FORM, CANCELLED, PAID,
         ERROR, Form, DENIED, ACCEPTED, ORDERID_TRANSACTION_SEPARATOR,
-        ResponseError, force_byte)
+        ResponseError, force_byte, force_text)
 def N_(message): return message
 
 ENVIRONMENT_TEST = 'TEST'
@@ -494,7 +494,7 @@ class Payment(PaymentCommon):
         # arrondi comptable francais
         amount = amount.quantize(Decimal('1.'), rounding=ROUND_HALF_UP)
         params = {
-                'AMOUNT': amount,
+                'AMOUNT': unicode(amount),
                 'ORDERID': reference,
                 'PSPID': self.pspid,
                 'LANGUAGE': language,
@@ -517,7 +517,7 @@ class Payment(PaymentCommon):
         params['SHASIGN'] = self.sha_sign_in(params)
         # uniformize all values to UTF-8 string
         for key in params:
-            params[key] = unicode(params[key]).encode('utf-8')
+            params[key] = force_text(params[key])
         url = self.get_request_url()
         form = Form(
                 url=url,
@@ -532,6 +532,10 @@ class Payment(PaymentCommon):
         params = dict((key.upper(), params[key][0]) for key in params)
         if not set(params) >= set(['ORDERID', 'PAYID', 'STATUS', 'NCERROR']):
             raise ResponseError()
+
+        # uniformize iso-8859-1 encoded values
+        for key in params:
+            params[key] = force_text(params[key], 'iso-8859-1')
         reference = params['ORDERID']
         transaction_id = params['PAYID']
         status = params['STATUS']
diff --git a/tests/test_ogone.py b/tests/test_ogone.py
index ba7e8d7..f13aa6e 100644
--- a/tests/test_ogone.py
+++ b/tests/test_ogone.py
@@ -49,14 +49,30 @@ class OgoneTests(TestCase):
                 self.assertIn(name, values)
                 self.assertEqual(node.attrib['value'], values[name])
 
-    def test_response(self):
+    def test_unicode_response(self):
         ogone_backend = eopayment.Payment('ogone', BACKEND_PARAMS)
         order_id = 'myorder'
-        data = {'orderid': order_id + eopayment.common.ORDERID_TRANSACTION_SEPARATOR + 'RtEpMXZn4dX8k1rYbwLlby',
-                'payid': '32100123', 'status': 9, 'ncerror': 0}
+        data = {'orderid': u'myorder', 'status': u'9', 'payid': u'3011229363',
+                'cn': u'Usér', 'ncerror': u'0',
+                'trxdate': u'10/24/16', 'acceptance': u'test123',
+                'currency': u'eur', 'amount': u'7.5',
+                'shasign': u'3EE0CF69B5A8514962C9CF8A545861F0CA1C6891'}
+        # uniformize to utf-8 first
+        for k in data:
+            data[k] = eopayment.common.force_byte(data[k])
         response = ogone_backend.response(urllib.urlencode(data))
+        assert response.signed
         self.assertEqual(response.order_id, order_id)
 
+    def test_iso_8859_1_response(self):
+        ogone_backend = eopayment.Payment('ogone', BACKEND_PARAMS)
+        order_id = 'lRXK4Rl1N2yIR3R5z7Kc'
+        backend_response = 'orderID=lRXK4Rl1N2yIR3R5z7Kc&currency=EUR&amount=7%2E5&PM=CreditCard&ACCEPTANCE=test123&STATUS=9&CARDNO=XXXXXXXXXXXX9999&ED=0118&CN=Miha%EF+Serghe%EF&TRXDATE=10%2F24%2F16&PAYID=3011228911&NCERROR=0&BRAND=MasterCard&IP=80%2E12%2E92%2E47&SHASIGN=435D5E36E1F4B17739C1054FFD204218E65C15AB'
+        response = ogone_backend.response(backend_response)
+        assert response.signed
+        self.assertEqual(response.order_id, order_id)
+
+
     def test_bad_response(self):
         ogone_backend = eopayment.Payment('ogone', BACKEND_PARAMS)
         order_id = 'myorder'