diff --git a/guix-data-service/jobs/load-new-guix-revision.scm b/guix-data-service/jobs/load-new-guix-revision.scm
index c8f9564..24a24e4 100644
--- a/guix-data-service/jobs/load-new-guix-revision.scm
+++ b/guix-data-service/jobs/load-new-guix-revision.scm
@@ -1864,6 +1864,11 @@ SELECT 1 FROM derivation_source_file_nars WHERE derivation_source_file_id = $1"
   (define postgresql-connection-pool
     (make-resource-pool
      (lambda ()
+       (with-time-logging
+           "waiting for guix-revision-id"
+         ;; This uses the transaction lock, so wait until the transaction has
+         ;; committed
+         (fibers-force guix-revision-id-promise))
        (with-time-logging
            "acquiring advisory transaction lock: load-new-guix-revision-inserts"
          ;; Wait until this is the only transaction inserting data, to