diff --git a/contrib/netbsd-tests/lib/libc/sys/t_timer_create.c b/contrib/netbsd-tests/lib/libc/sys/t_timer_create.c
index ce1fb99eb1ad..168bad72c414 100644
--- a/contrib/netbsd-tests/lib/libc/sys/t_timer_create.c
+++ b/contrib/netbsd-tests/lib/libc/sys/t_timer_create.c
@@ -38,7 +38,11 @@ static timer_t t;
 static bool fail = true;
 
 static void
+#if defined(__FreeBSD__)
+timer_signal_handler(int signo, siginfo_t *si, void *osi __unused)
+#else
 timer_signal_handler(int signo, siginfo_t *si, void *osi)
+#endif
 {
 	timer_t *tp;