diff --git a/minioevents.py b/minioevents.py
index 3bbe233..8fd3a68 100644
--- a/minioevents.py
+++ b/minioevents.py
@@ -114,7 +114,7 @@ def _key_mapper(ce: CloudEvent) -> Any | None:  # noqa: ANN401
                 producer_topic,
                 key=km.key,
                 value=km.value,
-                headers=km.headers if km.headers else None,
+                headers=km.headers if km.headers else [],
             ).add_errback(on_send_error)
         producer.flush()