diff --git a/unit_tests/test_utils.py b/unit_tests/test_utils.py
index 941ddb09..90db851e 100644
--- a/unit_tests/test_utils.py
+++ b/unit_tests/test_utils.py
@@ -131,7 +131,7 @@ def patch_open():
 
     Yields the mock for "open" and "file", respectively.'''
     mock_open = MagicMock(spec=open)
-    mock_file = MagicMock(spec=file)
+    mock_file = MagicMock(spec=file)  # noqa - transitional py2 py3
 
     @contextmanager
     def stub_open(*args, **kwargs):