diff --git a/force_bdss/core/tests/test_verifier.py b/force_bdss/core/tests/test_verifier.py
index 4b8b33f13af041972395fd7b9a874f87fc8016aa..7ba7017e7952ce5315ca6d27031a3a84f327acc3 100644
--- a/force_bdss/core/tests/test_verifier.py
+++ b/force_bdss/core/tests/test_verifier.py
@@ -124,7 +124,7 @@ class TestVerifier(unittest.TestCase):
         ds_model.output_slot_info[0].name = ''
         errors = verify_workflow(wf)
         self.assertEqual(len(errors), 2)
-        self.assertIn("Undefined name for output parameter",
+        self.assertIn("Undefined names for all output parameters",
                       errors[1].local_error)
 
     def test_multi_error_format(self):