diff --git a/adjtimex-decl.patch b/adjtimex-decl.patch
new file mode 100644
index 0000000..23a1a36
--- /dev/null
+++ b/adjtimex-decl.patch
@@ -0,0 +1,12 @@
+diff -up adjtimex-1.29/adjtimex.c.decl adjtimex-1.29/adjtimex.c
+--- adjtimex-1.29/adjtimex.c.decl	2025-01-07 10:50:34.218356076 +0100
++++ adjtimex-1.29/adjtimex.c	2025-01-07 10:50:42.286350666 +0100
+@@ -185,7 +185,7 @@ static void cmos_read_time (time_t *cmos
+ static void busywait_uip_fall(struct timeval *timestamp);
+ static void busywait_second_change(struct tm *cmos, struct timeval *timestamp);
+ static void compare(void);
+-static void failntpdate();
++static void failntpdate(char *s);
+ static void reset_time_status(void);
+ static struct cmos_adj *get_cmos_adjustment(void);
+ static void log_times(void);
diff --git a/adjtimex.spec b/adjtimex.spec
index 81c3069..698723a 100644
--- a/adjtimex.spec
+++ b/adjtimex.spec
@@ -5,6 +5,7 @@ Release: 31%{?dist}
 License: GPL-2.0-or-later
 Source: http://ftp.debian.org/debian/pool/main/a/adjtimex/%{name}_%{version}.orig.tar.gz
 Patch1: adjtimex-manopts.patch
+Patch2: adjtimex-decl.patch
 BuildRequires: gcc
 BuildRequires: make
 
@@ -19,6 +20,7 @@ adjtimex to view kernel time variables.
 %prep
 %setup -q
 %patch -P1 -p1 -b .manopts
+%patch -P2 -p1 -b .decl
 
 %build
 %configure