diff --git a/usr.sbin/rpc.lockd/lockd.c b/usr.sbin/rpc.lockd/lockd.c
index 20fec254d859..15c9d69fb9ee 100644
--- a/usr.sbin/rpc.lockd/lockd.c
+++ b/usr.sbin/rpc.lockd/lockd.c
@@ -92,13 +92,17 @@ main(argc, argv)
 	char **argv;
 {
 	SVCXPRT *transp;
-	int ch, i, maxindex, s;
+	int ch, i, maxindex, r, s, sock;
+	struct sockaddr_in sin;
+	struct sockaddr_in6 sin6;
+	char *endptr;
 	struct sigaction sigalarm;
 	int grace_period = 30;
 	struct netconfig *nconf;
 	int maxrec = RPC_MAXDATASIZE;
+	in_port_t svcport = 0;
 
-	while ((ch = getopt(argc, argv, "d:g:")) != (-1)) {
+	while ((ch = getopt(argc, argv, "d:g:p:")) != (-1)) {
 		switch (ch) {
 		case 'd':
 			debug_level = atoi(optarg);
@@ -114,6 +118,13 @@ main(argc, argv)
 				/* NOTREACHED */
 			}
 			break;
+		case 'p':
+			endptr = NULL;
+			svcport = (in_port_t)strtoul(optarg, &endptr, 10);
+			if (endptr == NULL || *endptr != '\0' ||
+			    svcport == 0 || svcport >= IPPORT_MAX)
+				usage();
+			break;
 		default:
 		case '?':
 			usage();
@@ -141,16 +152,81 @@ main(argc, argv)
 		maxindex = 4;
 	}
 
+	if (svcport != 0) {
+		bzero(&sin, sizeof(struct sockaddr_in));
+		sin.sin_len = sizeof(struct sockaddr_in);
+		sin.sin_family = AF_INET;
+		sin.sin_port = htons(svcport);
+
+		bzero(&sin6, sizeof(struct sockaddr_in6));
+		sin6.sin6_len = sizeof(struct sockaddr_in6);
+		sin6.sin6_family = AF_INET6;
+		sin6.sin6_port = htons(svcport);
+	}
+
 	rpc_control(RPC_SVC_CONNMAXREC_SET, &maxrec);
 
 	for (i = 0; i < maxindex; i++) {
 		nconf = getnetconfigent(transports[i]);
 		if (nconf == NULL)
-			errx(1, "cannot get %s netconf: %s.", transports[i],
-			    nc_sperror());
+		    errx(1, "cannot get %s netconf: %s.", transports[i],
+			nc_sperror());
+
+		if (svcport != 0) {
+		    if (strcmp(nconf->nc_netid, "udp6") == 0) {
+			sock = socket(AF_INET6, SOCK_DGRAM,
+			    IPPROTO_UDP);
+			if (sock != -1) {
+			    r = bindresvport_sa(sock, 
+			        (struct sockaddr *)&sin6);
+			    if (r != 0) {
+				syslog(LOG_ERR, "bindresvport: %m");
+				exit(1);
+			    }
+			}
+		    }
+		    else if (strcmp(nconf->nc_netid, "udp") == 0) {
+			sock = socket(AF_INET, SOCK_DGRAM,
+			    IPPROTO_UDP);
+			if (sock != -1) {
+			    r = bindresvport(sock, &sin);
+			    if (r != 0) {
+				syslog(LOG_ERR, "bindresvport: %m");
+				exit(1);
+			    }
+			}
+		    }
+		    else if (strcmp(nconf->nc_netid, "tcp6") == 0) {
+			sock = socket(AF_INET6, SOCK_STREAM,
+			    IPPROTO_TCP);
+			if (sock != -1) {
+			    r = bindresvport_sa(sock, 
+			        (struct sockaddr *)&sin6);
+			    if (r != 0) {
+				syslog(LOG_ERR, "bindresvport: %m");
+				exit(1);
+			    }
+			}
+		    }
+		    else if (strcmp(nconf->nc_netid, "tcp") == 0) {
+			sock = socket(AF_INET, SOCK_STREAM,
+			    IPPROTO_TCP);
+			if (sock != -1) {
+			    r = bindresvport(sock, &sin);
+			    if (r != 0) {
+				syslog(LOG_ERR, "bindresvport: %m");
+				exit(1);
+			    }
+			}
+		    }
+
+		    transp = svc_tli_create(sock, nconf, NULL,
+		    	RPC_MAXDATASIZE, RPC_MAXDATASIZE);
+		} else {
+		    transp = svc_tli_create(RPC_ANYFD, nconf, NULL,
+		    	RPC_MAXDATASIZE, RPC_MAXDATASIZE);
+		}
 
-		transp = svc_tli_create(RPC_ANYFD, nconf, NULL,
-		    RPC_MAXDATASIZE, RPC_MAXDATASIZE);
 		if (transp == NULL) {
 			errx(1, "cannot create %s service.", transports[i]);
 			/* NOTREACHED */
@@ -223,7 +299,8 @@ sigalarm_handler(void)
 void
 usage()
 {
-	errx(1, "usage: rpc.lockd [-d <debuglevel>] [-g <grace period>]");
+	errx(1, "usage: rpc.lockd [-d <debuglevel>]"
+	    " [-g <grace period>] [-p <port>]");
 }
 
 /*
diff --git a/usr.sbin/rpc.lockd/rpc.lockd.8 b/usr.sbin/rpc.lockd/rpc.lockd.8
index 7c86bb6775cd..0b5d3486e673 100644
--- a/usr.sbin/rpc.lockd/rpc.lockd.8
+++ b/usr.sbin/rpc.lockd/rpc.lockd.8
@@ -33,7 +33,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd September 24, 1995
+.Dd April 3, 2007
 .Dt RPC.LOCKD 8
 .Os
 .Sh NAME
@@ -43,6 +43,7 @@
 .Nm
 .Op Fl d Ar debug_level
 .Op Fl g Ar grace period
+.Op Fl p Ar port
 .Sh DESCRIPTION
 The
 .Nm
@@ -83,6 +84,12 @@ During the grace period
 only accepts requests from hosts which are reinitialising locks which
 existed before the server restart.
 Default is 30 seconds.
+.It Fl p
+The
+.Fl p
+option allow to force the daemon to bind to the specified
+.Ar port ,
+for both AF_INET and AF_INET6 address families.
 .El
 .Pp
 Error conditions are logged to syslog, irrespective of the debug level,