diff --git a/guix-data-service/jobs/load-new-guix-revision.scm b/guix-data-service/jobs/load-new-guix-revision.scm
index e1cfd14..370e003 100644
--- a/guix-data-service/jobs/load-new-guix-revision.scm
+++ b/guix-data-service/jobs/load-new-guix-revision.scm
@@ -2410,14 +2410,15 @@ SELECT store_path FROM derivation_source_files WHERE id = $1"
                                    (let ((systems
                                           (map car derivation-file-names-by-system))
                                          (derivation-ids
-                                          (derivation-file-names->derivation-ids
-                                           postgresql-connection-pool
-                                           call-with-utility-thread
-                                           read-derivations/fiberized
-                                           derivation-ids-hash-table
-                                           (list->vector
-                                            (map cdr derivation-file-names-by-system))
-                                           #:log-tag "channel-instances")))
+                                          (vector->list
+                                           (derivation-file-names->derivation-ids
+                                            postgresql-connection-pool
+                                            call-with-utility-thread
+                                            read-derivations/fiberized
+                                            derivation-ids-hash-table
+                                            (list->vector
+                                             (map cdr derivation-file-names-by-system))
+                                            #:log-tag "channel-instances"))))
                                      (map cons systems derivation-ids))
                                    location-data)))
                           data-with-derivation-file-names)))