diff --git a/eopayment/sips2.py b/eopayment/sips2.py
index 3e434a9..91cf200 100644
--- a/eopayment/sips2.py
+++ b/eopayment/sips2.py
@@ -172,10 +172,6 @@ class Payment(PaymentCommon):
             data['billingContact.email'] = email
         if 'captureDay' in kwargs:
             data['captureDay'] == kwargs.get('captureDay')
-        if first_name:
-            data['billingContact.firstname'] = first_name
-        if last_name:
-            data['billingContact.lastname'] = last_name
         normal_return_url = self.normal_return_url
         if next_url and not normal_return_url:
             warnings.warn("passing next_url to request() is deprecated, "
diff --git a/tests/test_sips2.py b/tests/test_sips2.py
index d76a6be..e2d77ba 100644
--- a/tests/test_sips2.py
+++ b/tests/test_sips2.py
@@ -5,9 +5,9 @@ import eopayment
 def test_build_request():
     backend = eopayment.Payment('sips2', {})
     transaction, f, form = backend.request(amount=u'12', last_name=u'Foo',
-                                           first_name=u'Félix')
+                                           first_name=u'Félix000000')
     data = [f for f in form.fields if f['name'] == 'Data']
-    assert u'Félix' in data[0]['value']
+    assert not u'lix000000' in data[0]['value']
 
 def test_options():
     payment = eopayment.Payment('sips2', {'capture_mode': u'VALIDATION'})