diff --git a/examples/random-manifest.scm b/examples/random-manifest.scm
index ed96e90..446b16a 100644
--- a/examples/random-manifest.scm
+++ b/examples/random-manifest.scm
@@ -1,5 +1,5 @@
 ;;; random-manifest.scm -- Return a manifest of random entries.
-;;; Copyright © 2018, 2023 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2018, 2023-2024 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2018 Clément Lassieur <clement@lassieur.org>
 ;;;
 ;;; This file is part of Cuirass.
@@ -80,10 +80,16 @@
    (if (>= i 20)
        (reverse lst)
        (let* ((multiple-outputs? (zero? (modulo i 5)))
-              (dependency (and (= 0 (modulo i 3))
-                               (> i 0)
-                               (list-ref lst
-                                         (random (length lst) %state))))
+              (dependency (cond ((and (zero? (modulo i 3))
+                                      (> i 0))
+                                 (list-ref lst
+                                           (random (length lst) %state)))
+                                ((zero? (modulo i 4))
+                                 (make-job
+                                  "entropy"
+                                  (random-computed-file
+                                   "entropy-derivation-without-a-job")))
+                                (else #f)))
               (suffix (string-append
                        (if multiple-outputs?
                            "multiple-outputs"