diff --git a/letsencrypt-apache/letsencrypt_apache/tests/configurator_test.py b/letsencrypt-apache/letsencrypt_apache/tests/configurator_test.py
index fe7071f14..5052da893 100644
--- a/letsencrypt-apache/letsencrypt_apache/tests/configurator_test.py
+++ b/letsencrypt-apache/letsencrypt_apache/tests/configurator_test.py
@@ -69,11 +69,11 @@ class TwoVhost80Test(util.ApacheTest):
     @mock.patch("letsencrypt_apache.configurator.le_util.exe_exists")
     def test_prepare_old_aug(self, mock_exe_exists, _):
         mock_exe_exists.return_value = True
+        self.config.config_test = mock.Mock()
         self.config._check_aug_version = mock.Mock(return_value=False)
         self.assertRaises(
             errors.NotSupportedError, self.config.prepare)
 
-
     def test_add_parser_arguments(self):  # pylint: disable=no-self-use
         from letsencrypt_apache.configurator import ApacheConfigurator
         # Weak test..