diff --git a/sys/compat/linux/linux_timer.c b/sys/compat/linux/linux_timer.c
index 7dbddbe30adb..f2819bb66aa3 100644
--- a/sys/compat/linux/linux_timer.c
+++ b/sys/compat/linux/linux_timer.c
@@ -57,6 +57,8 @@ linux_convert_l_sigevent(struct l_sigevent *l_sig, struct sigevent *sig)
 	CP(*l_sig, *sig, sigev_notify);
 	switch (l_sig->sigev_notify) {
 	case L_SIGEV_SIGNAL:
+		if (!LINUX_SIG_VALID(l_sig->sigev_signo))
+			return (EINVAL);
 		sig->sigev_notify = SIGEV_SIGNAL;
 		sig->sigev_signo = linux_to_bsd_signal(l_sig->sigev_signo);
 		PTRIN_CP(*l_sig, *sig, sigev_value.sival_ptr);
@@ -73,6 +75,8 @@ linux_convert_l_sigevent(struct l_sigevent *l_sig, struct sigevent *sig)
 		return (EINVAL);
 #endif
 	case L_SIGEV_THREAD_ID:
+		if (!LINUX_SIG_VALID(l_sig->sigev_signo))
+			return (EINVAL);
 		sig->sigev_notify = SIGEV_THREAD_ID;
 		CP2(*l_sig, *sig, _l_sigev_un._tid, sigev_notify_thread_id);
 		sig->sigev_signo = linux_to_bsd_signal(l_sig->sigev_signo);