diff --git a/docker/conf/indexer_journal_client.yml b/docker/conf/indexer_journal_client.yml
--- a/docker/conf/indexer_journal_client.yml
+++ b/docker/conf/indexer_journal_client.yml
@@ -2,6 +2,7 @@
   brokers:
     - kafka
   group_id: swh.indexer.journal_client
+  prefix: swh.journal.objects
 
 max_messages: 50