diff --git a/nsupdate.sh b/nsupdate.sh
index 5fe991f..eeab470 100755
--- a/nsupdate.sh
+++ b/nsupdate.sh
@@ -3,10 +3,9 @@
 # Registers the local IPv6 address to the DNS
 
 IP6="`whatsmyip6`"
-KNOT="${KNOT:-${IP6}}"
+KNOT="${KNOT:-knot.${DOMAIN}}"
 
 test -z "${IP6}" && exit 1
-test -z "${KNOT}" && exit 1
 test -z "${DOMAIN}" && exit 1
 
 # Add a dot if the hostname contains the domain