diff --git a/force_bdss/mco/base_mco_factory.py b/force_bdss/mco/base_mco_factory.py
index c8236553961461ff3e502e0fab73a5abccf10644..cde66f76d1e8d89374c4f9422428853950af1a14 100644
--- a/force_bdss/mco/base_mco_factory.py
+++ b/force_bdss/mco/base_mco_factory.py
@@ -135,3 +135,4 @@ class BaseMCOFactory(HasStrictTraits):
         -------
         List of BaseMCOParameterFactory
         """
+        return []
diff --git a/force_bdss/mco/tests/test_base_mco_factory.py b/force_bdss/mco/tests/test_base_mco_factory.py
index e070daf6841b0e899ce4eef1218c972a6875317a..241abc438ff62ef69fc1a6d79d357a2a2eb4e22d 100644
--- a/force_bdss/mco/tests/test_base_mco_factory.py
+++ b/force_bdss/mco/tests/test_base_mco_factory.py
@@ -29,6 +29,7 @@ class TestBaseMCOFactory(unittest.TestCase):
                               DummyMCOCommunicator)
         self.assertIsInstance(factory.create_model(),
                               DummyMCOModel)
+        self.assertEqual(factory.parameter_factories(), [])
 
     def test_broken_get_identifier(self):
         class Broken(DummyMCOFactory):