diff --git a/guix/build/syscalls.scm b/guix/build/syscalls.scm
index 248d6761fc..ae79a9708f 100644
--- a/guix/build/syscalls.scm
+++ b/guix/build/syscalls.scm
@@ -1,5 +1,5 @@
 ;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2014, 2015, 2016, 2017, 2018, 2019 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2014, 2015, 2016, 2017, 2018, 2019, 2020 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2015 David Thompson <davet@gnu.org>
 ;;; Copyright © 2015 Mark H Weaver <mhw@netris.org>
 ;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
@@ -1140,7 +1140,7 @@ (define (call-with-file-lock/no-wait file thunk handler)
                       ;; at this point.
                       (if (= ENOSYS (system-error-errno (cons key args)))
                           #f
-                          (apply throw args)))
+                          (apply throw key args)))
                     (_ (apply throw key args)))))))
     (dynamic-wind
       (lambda ()