diff --git a/tests/derivations.scm b/tests/derivations.scm
index 1b32ab5ffd..5f1ca56b50 100644
--- a/tests/derivations.scm
+++ b/tests/derivations.scm
@@ -125,7 +125,7 @@ (define prefix-len (string-length dir))
                               #:env-vars '(("HOME" . "/homeless")
                                            ("zzz"  . "Z!")
                                            ("AAA"  . "A!"))
-                              #:inputs `((,builder))))
+                              #:inputs `((,%bash) (,builder))))
          (succeeded?
           (build-derivations %store (list drv))))
     (and succeeded?
@@ -149,7 +149,8 @@ (define prefix-len (string-length dir))
                                  ;; builder.
                                  #:env-vars `(("in" . ,input*))
 
-                                 #:inputs `((,builder)
+                                 #:inputs `((,%bash)
+                                            (,builder)
                                             (,input))))) ; ← local file name
     (and (build-derivations %store (list drv))
          ;; Note: we can't compare the files because the above trick alters
@@ -211,11 +212,11 @@ (define prefix-len (string-length dir))
          (final1     (derivation %store "final"
                                  %bash `(,builder3)
                                  #:env-vars `(("in" . ,fixed-out))
-                                 #:inputs `((,builder3) (,fixed1))))
+                                 #:inputs `((,%bash) (,builder3) (,fixed1))))
          (final2     (derivation %store "final"
                                  %bash `(,builder3)
                                  #:env-vars `(("in" . ,fixed-out))
-                                 #:inputs `((,builder3) (,fixed2))))
+                                 #:inputs `((,%bash) (,builder3) (,fixed2))))
          (succeeded? (build-derivations %store
                                         (list final1 final2))))
     (and succeeded?
@@ -231,7 +232,7 @@ (define prefix-len (string-length dir))
                                  #:env-vars '(("HOME" . "/homeless")
                                               ("zzz"  . "Z!")
                                               ("AAA"  . "A!"))
-                                 #:inputs `((,builder))
+                                 #:inputs `((,%bash) (,builder))
                                  #:outputs '("out" "second")))
          (succeeded? (build-derivations %store (list drv))))
     (and succeeded?
@@ -251,7 +252,7 @@ (define prefix-len (string-length dir))
                                         '()))
          (drv        (derivation %store "fixed"
                                  %bash `(,builder)
-                                 #:inputs `((,builder))
+                                 #:inputs `((,%bash) (,builder))
                                  #:outputs '("out" "AAA")))
          (succeeded? (build-derivations %store (list drv))))
     (and succeeded?
@@ -285,7 +286,7 @@ (define prefix-len (string-length dir))
                                         '()))
          (mdrv       (derivation %store "multiple-output"
                                  %bash `(,builder1)
-                                 #:inputs `((,builder1))
+                                 #:inputs `((,%bash) (,builder1))
                                  #:outputs '("out" "two")))
          (builder2   (add-text-to-store %store "my-mo-user-builder.sh"
                                         "read x < $one;
@@ -300,7 +301,8 @@ (define prefix-len (string-length dir))
                                               ("two"
                                                . ,(derivation->output-path
                                                    mdrv "two")))
-                                 #:inputs `((,builder2)
+                                 #:inputs `((,%bash)
+                                            (,builder2)
                                             ;; two occurrences of MDRV:
                                             (,mdrv)
                                             (,mdrv "two")))))