diff --git a/guix-data-service/jobs/load-new-guix-revision.scm b/guix-data-service/jobs/load-new-guix-revision.scm
index 6995dac..8650202 100644
--- a/guix-data-service/jobs/load-new-guix-revision.scm
+++ b/guix-data-service/jobs/load-new-guix-revision.scm
@@ -661,11 +661,12 @@ ORDER BY load_new_guix_revision_jobs.id DESC")
                                (lambda (logging-conn)
                                  (let ((logging-port (log-port id logging-conn)))
                                    (set-current-output-port logging-port)
-                                   (set-current-error-port logging-port))
-                                 (let ((result
-                                        (load-new-guix-revision conn git-repository-id commit)))
-                                   (combine-log-parts! logging-conn id)
-                                   result)))))
+                                   (set-current-error-port logging-port)
+                                   (let ((result
+                                          (parameterize ((current-build-output-port logging-port))
+                                            (load-new-guix-revision conn git-repository-id commit))))
+                                     (combine-log-parts! logging-conn id)
+                                     result))))))
                          (set-current-output-port previous-output-port)
                          (set-current-error-port previous-error-port)
                          result)))