diff --git a/test/test_streams.py b/test/test_streams.py
index bce3ffa..f93cb8d 100644
--- a/test/test_streams.py
+++ b/test/test_streams.py
@@ -113,6 +113,7 @@ def test_writer_bad_message(wfile, writer):
         hour=1,
         minute=1,
         second=1,
+        tzinfo=datetime.timezone.utc
     ))
 
     assert wfile.getvalue() in [