diff --git a/tests/test_account_dunning_letter.py b/tests/test_account_dunning_letter.py
index 6165879d2e..195db6f7fc 100644
--- a/tests/test_account_dunning_letter.py
+++ b/tests/test_account_dunning_letter.py
@@ -6,10 +6,10 @@ import trytond.tests.test_tryton
 from trytond.tests.test_tryton import ModuleTestCase
 from trytond.tests.test_tryton import doctest_teardown, doctest_checker
 
-from trytond.modules.company.tests import CompanyMultiValueTestMixin
+from trytond.modules.company.tests import CompanyTestMixin
 
 
-class AccountDunningLetterTestCase(CompanyMultiValueTestMixin, ModuleTestCase):
+class AccountDunningLetterTestCase(CompanyTestMixin, ModuleTestCase):
     'Test AccountDunningLetter module'
     module = 'account_dunning_letter'