diff --git a/apps/emqx_bridge_gcp_pubsub/src/emqx_bridge_gcp_pubsub_impl_producer.erl b/apps/emqx_bridge_gcp_pubsub/src/emqx_bridge_gcp_pubsub_impl_producer.erl
index 487118b3e..b75940227 100644
--- a/apps/emqx_bridge_gcp_pubsub/src/emqx_bridge_gcp_pubsub_impl_producer.erl
+++ b/apps/emqx_bridge_gcp_pubsub/src/emqx_bridge_gcp_pubsub_impl_producer.erl
@@ -70,7 +70,7 @@ query_mode(_Config) -> async.
 on_start(InstanceId, Config0) ->
     ?SLOG(info, #{
         msg => "starting_gcp_pubsub_bridge",
-        config => Config0
+        instance_id => InstanceId
     }),
     Config = maps:update_with(service_account_json, fun emqx_utils_maps:binary_key_map/1, Config0),
     #{service_account_json := #{<<"project_id">> := ProjectId}} = Config,