diff --git a/usr.sbin/ppp/nat_cmd.c b/usr.sbin/ppp/nat_cmd.c
index f1d75ed3128..baa53503604 100644
--- a/usr.sbin/ppp/nat_cmd.c
+++ b/usr.sbin/ppp/nat_cmd.c
@@ -345,7 +345,7 @@ nat_SetTarget(struct cmdargs const *arg)
   struct in_addr addr;
 
   if (arg->argc == arg->argn) {
-    addr.s_addr = INADDR_ANY;
+    addr.s_addr = INADDR_NONE;
     PacketAliasSetTarget(addr);
     return 0;
   }
diff --git a/usr.sbin/ppp/ppp.8 b/usr.sbin/ppp/ppp.8
index da73af10a65..a9c16373717 100644
--- a/usr.sbin/ppp/ppp.8
+++ b/usr.sbin/ppp/ppp.8
@@ -2997,6 +2997,11 @@ Set the given target address or clear it if no address is given.  The target
 address is used by libalias to specify how to NAT incoming packets by default.
 If a target address is not set, the alias address (that of the tun interface)
 is used.
+.Pp
+The target address may be set to
+.Dq default ,
+in which case libalias will not alter the destination address of new
+incoming data.
 .It nat use_sockets yes|no
 When enabled, this option tells the network address translation engine to
 create a socket so that it can guarantee a correct incoming ftp data or
diff --git a/usr.sbin/ppp/ppp.8.m4 b/usr.sbin/ppp/ppp.8.m4
index da73af10a65..a9c16373717 100644
--- a/usr.sbin/ppp/ppp.8.m4
+++ b/usr.sbin/ppp/ppp.8.m4
@@ -2997,6 +2997,11 @@ Set the given target address or clear it if no address is given.  The target
 address is used by libalias to specify how to NAT incoming packets by default.
 If a target address is not set, the alias address (that of the tun interface)
 is used.
+.Pp
+The target address may be set to
+.Dq default ,
+in which case libalias will not alter the destination address of new
+incoming data.
 .It nat use_sockets yes|no
 When enabled, this option tells the network address translation engine to
 create a socket so that it can guarantee a correct incoming ftp data or