diff --git a/gnu/packages/audio.scm b/gnu/packages/audio.scm
index c0d8c55098..40519374ae 100644
--- a/gnu/packages/audio.scm
+++ b/gnu/packages/audio.scm
@@ -50,6 +50,7 @@
 ;;; Copyright © 2024 mio <stigma@disroot.org>
 ;;; Copyright © 2024 Nikita Domnitskii <nikita@domnitskii.me>
 ;;; Copyright © 2024 Roman Scherer <roman@burningswell.com>
+;;; Copyright © 2024 Janneke Nieuwenhuizen <janneke@gnu.org>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -2649,13 +2650,14 @@ (define-public jack-1
         (base32 "0i6l25dmfk2ji2lrakqq9icnwjxklgcjzzk65dmsff91z2zva5rm"))))
     (build-system gnu-build-system)
     (arguments
-     `(#:phases (modify-phases %standard-phases
+     `(#:configure-flags
+       '("CFLAGS=-g -O2 -Wno-error=incompatible-pointer-types")
+       #:phases (modify-phases %standard-phases
                   (add-after 'unpack 'patch-configure
                     (lambda _
                       (substitute* "configure"
                         ;; Install to <out/lib> regardless of platform.
-                        (("libnn=lib64") "libnn=lib"))
-                      #t)))))
+                        (("libnn=lib64") "libnn=lib")))))))
     (inputs
      (list alsa-lib readline))
     ;; uuid.h is included in the JACK type headers