diff --git a/tests/minetest.scm b/tests/minetest.scm
index cbb9e83889..78469bf95b 100644
--- a/tests/minetest.scm
+++ b/tests/minetest.scm
@@ -194,7 +194,7 @@ (define argument-list->json (cut apply arguments->json <>))
     (scm->json-port
      (list->vector (filter-map argument-list->json sorted-argument-lists))))
   (mock ((guix http-client) http-fetch
-         (lambda* (url #:key headers)
+         (lambda* (url #:key headers timeout)
            (unless (string-prefix? "mock://api/packages/" url)
              (error "the URL ~a should not be used" url))
            (define resource