diff --git a/certbot-apache/tests/configurator_test.py b/certbot-apache/tests/configurator_test.py
index 8301def52..a9af7c443 100644
--- a/certbot-apache/tests/configurator_test.py
+++ b/certbot-apache/tests/configurator_test.py
@@ -1840,7 +1840,7 @@ class InstallSslOptionsConfTest(util.ApacheTest):
 
     def test_open_module_file(self):
         mock_open = mock.mock_open(read_data="testing 12 3")
-        with mock.patch("certbot_apache._internal.configurator.open", mock_open):
+        with mock.patch("six.moves.builtins.open", mock_open):
             self.assertEqual (self.config._open_module_file("/nonsense/"), "testing 12 3")
 
 if __name__ == "__main__":