diff --git a/gnu/packages/lisp-check.scm b/gnu/packages/lisp-check.scm
index b52f44e23f..39f7d8ca61 100644
--- a/gnu/packages/lisp-check.scm
+++ b/gnu/packages/lisp-check.scm
@@ -941,7 +941,13 @@ (define-public sbcl-xlunit
          (file-name (git-file-name name version))
          (sha256
           (base32
-           "0argfmp9nghs4sihyj3f8ch9qfib2b7ll07v5m9ziajgzsfl5xw3"))))
+           "0argfmp9nghs4sihyj3f8ch9qfib2b7ll07v5m9ziajgzsfl5xw3"))
+         (modules '((guix build utils)))
+         (snippet
+          ;; The useless bundled debian folder drags `make' into the closure.
+          `(begin
+             (delete-file-recursively "debian")
+             #t))))
       (build-system asdf-build-system/sbcl)
       (arguments
        '(#:phases