diff --git a/test/test_streams.py b/test/test_streams.py
index 6985aec..9e64489 100644
--- a/test/test_streams.py
+++ b/test/test_streams.py
@@ -119,6 +119,7 @@ def test_writer_bad_message(wfile, writer):
         hour=1,
         minute=1,
         second=1,
+        tzinfo=datetime.timezone.utc
     ))

     assert wfile.getvalue() in [
