diff --git a/tests/test_util.py b/tests/test_util.py
index 3a85ee9d..626c8711 100644
--- a/tests/test_util.py
+++ b/tests/test_util.py
@@ -157,7 +157,7 @@ def test_py38_support(self):
     def test_filenotfound(self):
         exc = FileNotFoundError()
         exc.filename = "FILENAME"
-        with mock.patch("importlib.resources.as_file", side_effect=exc):
+        with mock.patch("importlib.resources.as_file", create=True, side_effect=exc):
             res = DottedFileNameFinder().get_dotted_filename('tg.tests_test_filenotfound')
         assert res == os.path.abspath("FILENAME")