diff --git a/sys/netinet/tcp_fsm.h b/sys/netinet/tcp_fsm.h
index eb9a909a2dfb..37752c4fc021 100644
--- a/sys/netinet/tcp_fsm.h
+++ b/sys/netinet/tcp_fsm.h
@@ -92,7 +92,7 @@ static u_char	tcp_outflags[TCP_NSTATES] = {
 	TH_ACK,			/* 4, ESTABLISHED */
 	TH_ACK,			/* 5, CLOSE_WAIT */
 	TH_FIN|TH_ACK,		/* 6, FIN_WAIT_1 */
-	TH_ACK,			/* 7, CLOSING */
+	TH_FIN|TH_ACK,		/* 7, CLOSING */
 	TH_FIN|TH_ACK,		/* 8, LAST_ACK */
 	TH_ACK,			/* 9, FIN_WAIT_2 */
 	TH_ACK,			/* 10, TIME_WAIT */