diff --git a/nsupdate.sh b/nsupdate.sh
index 2d3b705..dd03c23 100755
--- a/nsupdate.sh
+++ b/nsupdate.sh
@@ -9,12 +9,15 @@ test -z "${IP6}" && exit 1
 test -z "${KNOT}" && exit 1
 test -z "${DOMAIN}" && exit 1
 
+# Add a dot if the hostname contains the domain
+echo "${HOSTNAME}" | grep -q "\.${DOMAIN}$" && DOT="."
+
 knsupdate <<DNS
 server ${KNOT}
 zone ${DOMAIN}.
 origin ${DOMAIN}.
 ttl 60
-add ${HOSTNAME} AAAA ${IP6}
+add ${HOSTNAME}${DOT} AAAA ${IP6}
 send
 quit
 DNS