diff --git a/gnu/packages/polkit.scm b/gnu/packages/polkit.scm
index 7113832e7ef..1f0388636e7 100644
--- a/gnu/packages/polkit.scm
+++ b/gnu/packages/polkit.scm
@@ -12,6 +12,7 @@
 ;;; Copyright © 2022 Marius Bakke <marius@gnu.org>
 ;;; Copyright © 2021, 2022 Maxim Cournoyer <maxim.cournoyer@gmail.com>
 ;;; Copyright © 2025 Josep Bigorra <jjbigorra@gmail.com>
+;;; Copyright © 2024 Janneke Nieuwenhuizen <janneke@gnu.org>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -156,6 +157,10 @@ able to request elevated privileges.")
                      '()))
       #:phases
       #~(modify-phases %standard-phases
+          (add-before 'configure 'relax-gcc-14-strictness
+            (lambda _
+              (setenv "CFLAGS"
+                      "-g -O2 -Wno-error=implicit-function-declaration")))
           (add-before 'check 'patch-bash
             (lambda _
               (substitute* (list "subprojects/mocklibc-1.0/bin/mocklibc"