diff --git a/examples/pubsub-streaming/publisher.py b/examples/pubsub-streaming/publisher.py
index 9c18ac3c..fd797470 100644
--- a/examples/pubsub-streaming/publisher.py
+++ b/examples/pubsub-streaming/publisher.py
@@ -28,7 +28,7 @@
             topic_name='TOPIC_A',
             data=json.dumps(req_data),
             data_content_type='application/json',
-            publish_metadata={'ttlInSeconds': '100', 'rawPayload': 'false'}
+            publish_metadata={'ttlInSeconds': '100', 'rawPayload': 'false'},
         )
 
         # Print the request