diff --git a/vnc/vnckill b/vnc/vnckill
index eb5d8ca..0e2fdfd 100755
--- a/vnc/vnckill
+++ b/vnc/vnckill
@@ -6,7 +6,7 @@ function helpexit() {
 }
 [[ "$1" = "-h" ]] && helpexit
 
-dn=$( echo  $UID | sed 's/.*\(....\)$/\1/' )
+dn=$(( 5900 + $UID % 40000 ))
 
 vncserver -kill :$dn || echo "vnc may have not been running"
 rm -f /tmp/.X${dn}-lock
diff --git a/vnc/vncs b/vnc/vncs
index 43e0b47..471966c 100755
--- a/vnc/vncs
+++ b/vnc/vncs
@@ -6,7 +6,7 @@ function helpexit() {
 }
 [[ "$1" = "-h" ]] && helpexit
 
-dn=$( echo  $UID | sed 's/.*\(....\)$/\1/' )
+dn=$(( 5900 + $UID % 40000 ))
 
 vncserver :$dn -depth 24 \
  -geometry 1024x768 \
@@ -18,9 +18,9 @@ vncserver :$dn -depth 24 \
  -geometry 1920x1200 \
  -geometry 2560x1440 \
  -geometry 2560x1600 \
- -rfbport $(( 5900 + $dn ))
+ -rfbport $dn
 ec=$?
 echo "Kill with vnckill"
 echo "use vncdisp to change resolution"
-echo Your VNC connection port is $HOSTNAME:$(( 5900 + $dn ))
+echo Your VNC connection port is $HOSTNAME:$dn
 exit $ec