diff --git a/sys/kern/kern_sig.c b/sys/kern/kern_sig.c
index 16bc1e44111..c847783cd3d 100644
--- a/sys/kern/kern_sig.c
+++ b/sys/kern/kern_sig.c
@@ -159,6 +159,10 @@ static int	kern_lognosys = 0;
 SYSCTL_INT(_kern, OID_AUTO, lognosys, CTLFLAG_RWTUN, &kern_lognosys, 0,
     "Log invalid syscalls");
 
+static int	kern_signosys = 1;
+SYSCTL_INT(_kern, OID_AUTO, signosys, CTLFLAG_RWTUN, &kern_signosys, 0,
+    "Send SIGSYS on return from invalid syscall");
+
 __read_frequently bool sigfastblock_fetch_always = false;
 SYSCTL_BOOL(_kern, OID_AUTO, sigfastblock_fetch_always, CTLFLAG_RWTUN,
     &sigfastblock_fetch_always, 0,
@@ -4219,7 +4223,7 @@ nosys(struct thread *td, struct nosys_args *args)
 
 	p = td->td_proc;
 
-	if (SV_PROC_FLAG(p, SV_SIGSYS) != 0) {
+	if (SV_PROC_FLAG(p, SV_SIGSYS) != 0 && kern_signosys) {
 		PROC_LOCK(p);
 		tdsignal(td, SIGSYS);
 		PROC_UNLOCK(p);