diff --git a/sys/netinet/tcp_timer.c b/sys/netinet/tcp_timer.c
index 04e0f9cd216c..df5eb2c12839 100644
--- a/sys/netinet/tcp_timer.c
+++ b/sys/netinet/tcp_timer.c
@@ -141,16 +141,14 @@ SYSCTL_INT(_net_inet_tcp, OID_AUTO, rexmit_drop_options, CTLFLAG_RW,
     &tcp_rexmit_drop_options, 0,
     "Drop TCP options from 3rd and later retransmitted SYN");
 
-static VNET_DEFINE(int, tcp_pmtud_blackhole_detect);
-#define	V_tcp_pmtud_blackhole_detect	VNET(tcp_pmtud_blackhole_detect)
+VNET_DEFINE(int, tcp_pmtud_blackhole_detect);
 SYSCTL_INT(_net_inet_tcp, OID_AUTO, pmtud_blackhole_detection,
     CTLFLAG_RW|CTLFLAG_VNET,
     &VNET_NAME(tcp_pmtud_blackhole_detect), 0,
     "Path MTU Discovery Black Hole Detection Enabled");
 
 #ifdef INET
-static VNET_DEFINE(int, tcp_pmtud_blackhole_mss) = 1200;
-#define	V_tcp_pmtud_blackhole_mss	VNET(tcp_pmtud_blackhole_mss)
+VNET_DEFINE(int, tcp_pmtud_blackhole_mss) = 1200;
 SYSCTL_INT(_net_inet_tcp, OID_AUTO, pmtud_blackhole_mss,
     CTLFLAG_RW|CTLFLAG_VNET,
     &VNET_NAME(tcp_pmtud_blackhole_mss), 0,
@@ -158,8 +156,7 @@ SYSCTL_INT(_net_inet_tcp, OID_AUTO, pmtud_blackhole_mss,
 #endif
 
 #ifdef INET6
-static VNET_DEFINE(int, tcp_v6pmtud_blackhole_mss) = 1220;
-#define	V_tcp_v6pmtud_blackhole_mss	VNET(tcp_v6pmtud_blackhole_mss)
+VNET_DEFINE(int, tcp_v6pmtud_blackhole_mss) = 1220;
 SYSCTL_INT(_net_inet_tcp, OID_AUTO, v6pmtud_blackhole_mss,
     CTLFLAG_RW|CTLFLAG_VNET,
     &VNET_NAME(tcp_v6pmtud_blackhole_mss), 0,
diff --git a/sys/netinet/tcp_timer.h b/sys/netinet/tcp_timer.h
index f14f929a4f95..5f4138cb26d2 100644
--- a/sys/netinet/tcp_timer.h
+++ b/sys/netinet/tcp_timer.h
@@ -198,6 +198,13 @@ extern int tcp_syn_backoff[];
 extern int tcp_finwait2_timeout;
 extern int tcp_fast_finwait2_recycle;
 
+VNET_DECLARE(int, tcp_pmtud_blackhole_detect);
+#define V_tcp_pmtud_blackhole_detect	VNET(tcp_pmtud_blackhole_detect)
+VNET_DECLARE(int, tcp_pmtud_blackhole_mss);
+#define	V_tcp_pmtud_blackhole_mss	VNET(tcp_pmtud_blackhole_mss)
+VNET_DECLARE(int, tcp_v6pmtud_blackhole_mss);
+#define V_tcp_v6pmtud_blackhole_mss	VNET(tcp_v6pmtud_blackhole_mss)
+
 int tcp_inpinfo_lock_add(struct inpcb *inp);
 void tcp_inpinfo_lock_del(struct inpcb *inp, struct tcpcb *tp);