diff --git a/eopayment/dummy.py b/eopayment/dummy.py
index 7e207bb..8f491f5 100644
--- a/eopayment/dummy.py
+++ b/eopayment/dummy.py
@@ -88,15 +88,6 @@ class Payment(PaymentCommon):
                 'type': str,
                 'default': 'origin',
             },
-            {
-                'name': 'siret',
-                'caption': 'dummy siret parameter',
-                'validation': lambda x: x.isdigit(),
-                'validation_err_msg': 'must be a number',
-                'type': str,
-                'default': '1234',
-                'required': True,
-            },
             {
                 'name': 'consider_all_response_signed',
                 'caption': (
@@ -149,7 +140,7 @@ class Payment(PaymentCommon):
             '%s amount %s name %s address %s email %s phone %s'
             ' next_url %s info1 %s info2 %s info3 %s kwargs: %s',
             __name__, amount, name, address, email, phone, info1, info2, info3, next_url, kwargs)
-        transaction_id = self.transaction_id(30, ALPHANUM, 'dummy', self.siret)
+        transaction_id = self.transaction_id(30, ALPHANUM, 'dummy')
         normal_return_url = self.normal_return_url
         if next_url and not normal_return_url:
             warnings.warn("passing next_url to request() is deprecated, "
@@ -162,7 +153,6 @@ class Payment(PaymentCommon):
             automatic_return_url = self.direct_notification_url
         query = {
             'transaction_id': transaction_id,
-            'siret': self.siret,
             'amount': amount,
             'email': email,
             'return_url': normal_return_url or '',
diff --git a/tests/test_dummy.py b/tests/test_dummy.py
index f0291d0..ec901ae 100644
--- a/tests/test_dummy.py
+++ b/tests/test_dummy.py
@@ -25,7 +25,6 @@ import pytest
 def backend():
     options = {
         'automatic_notification_url': 'http://example.com/direct_notification_url',
-        'siret': '1234',
         'origin': 'Mairie de Perpette-les-oies'
     }
     return eopayment.Payment('dummy', options)
@@ -33,7 +32,8 @@ def backend():
 
 def test_request(backend, freezer):
     freezer.move_to('2020-01-01 00:00:00+01:00')
-    transaction_id, method, raw_url = backend.request('10.10', capture_date=datetime.date(2020, 1, 7), subject='Repas pour 4 personnes')
+    transaction_id, method, raw_url = backend.request(
+        '10.10', capture_date=datetime.date(2020, 1, 7), subject='Repas pour 4 personnes')
     assert transaction_id
     assert method == 1
     url = urlparse(raw_url)
@@ -43,7 +43,6 @@ def test_request(backend, freezer):
     assert url.fragment == ''
     qs = {k: v[0] for k, v in parse_qs(url.query).items()}
     assert qs['transaction_id'] == transaction_id
-    assert qs['siret'] == '1234'
     assert qs['amount'] == '10.10'
     assert qs['origin'] == 'Mairie de Perpette-les-oies'
     assert qs['capture_day'] == '6'