diff --git a/sys/netpfil/ipfilter/netinet/ip_fil_freebsd.c b/sys/netpfil/ipfilter/netinet/ip_fil_freebsd.c
--- a/sys/netpfil/ipfilter/netinet/ip_fil_freebsd.c
+++ b/sys/netpfil/ipfilter/netinet/ip_fil_freebsd.c
@@ -1439,4 +1439,6 @@
 {
 	TUNABLE_INT_FETCH("net.inet.ipf.large_nat",
 		&softc->ipf_large_nat);
+	TUNABLE_INT_FETCH("net.inet.ipf.jail_allowed",
+		&softc->ipf_jail_allowed);
 }