diff --git a/tests/unit/sidecars/live_data_watcher_tests.py b/tests/unit/sidecars/live_data_watcher_tests.py
index 0d194673a..06b3392cd 100644
--- a/tests/unit/sidecars/live_data_watcher_tests.py
+++ b/tests/unit/sidecars/live_data_watcher_tests.py
@@ -35,7 +35,7 @@ def setUp(self):
                 sharded_file_key = default_file_key
             else:
                 # All other copies should include the sharded prefix.
-                sharded_file_key = default_file_key
+                sharded_file_key = str(file_shard_num) + "/" + default_file_key
             s3_client.put_object(
                 Bucket=bucket_name,
                 Key=sharded_file_key,