diff --git a/conf/discourse_defaults.conf b/conf/discourse_defaults.conf
index 598a140..e6939f1 100644
--- a/conf/discourse_defaults.conf
+++ b/conf/discourse_defaults.conf
@@ -161,7 +161,7 @@ message_bus_redis_replica_host =
 message_bus_redis_replica_port = 6379
 
 # message bus redis database
-message_bus_redis_db = 0
+message_bus_redis_db = __REDIS_DB__
 
 # message bus redis password
 message_bus_redis_password =