diff --git a/tests/test_party_avatar.py b/tests/test_party_avatar.py
index 7e2226cf1e..a3c8bc206a 100644
--- a/tests/test_party_avatar.py
+++ b/tests/test_party_avatar.py
@@ -6,7 +6,8 @@ import unittest
 try:
     from trytond.modules.company.tests import CompanyTestMixin
 except ImportError:
-    CompanyTestMixin = object
+    class CompanyTestMixin:
+        pass
 from trytond.tests.test_tryton import ModuleTestCase
 from trytond.tests.test_tryton import suite as test_suite