diff --git a/guix-data-service/jobs/load-new-guix-revision.scm b/guix-data-service/jobs/load-new-guix-revision.scm
index 1fd88b3..2511783 100644
--- a/guix-data-service/jobs/load-new-guix-revision.scm
+++ b/guix-data-service/jobs/load-new-guix-revision.scm
@@ -2088,7 +2088,8 @@ SELECT 1 FROM derivation_source_file_nars WHERE derivation_source_file_id = $1"
                                            read-derivations/fiberized
                                            derivation-ids-hash-table
                                            (list->vector
-                                            (map cdr derivation-file-names-by-system)))))
+                                            (map cdr derivation-file-names-by-system))
+                                           #:log-tag "channel-instances")))
                                      (map cons systems derivation-ids))
                                    location-data)))
                           data-with-derivation-file-names)))