diff --git a/lease-script b/lease-script
index c110201..d8d6562 100644
--- a/lease-script
+++ b/lease-script
@@ -3,18 +3,32 @@
 # Copyright (c) 2013-2019 Christian Hesse <mail@eworm.de>
 #
 # run scripts on DHCP lease
-# ( / ip dhcp-server set lease-script=lease-script [ find ] )
 
-:local Scripts {
+:local Scripts;
+:local ScriptsAssign {
   "dhcp-to-dns";
   "collect-wireless-mac.local";
   "dhcp-lease-comment.local";
   "collect-wireless-mac.capsman";
   "dhcp-lease-comment.capsman"
 }
+:local ScriptsDeAssign {
+  "dhcp-to-dns"
+}
 
-# delay a second to give time to update the lease table
-:delay 1s;
+:local State "";
+:if ($leaseBound = 0) do={
+  :set State "de";
+  :set Scripts $ScriptsDeAssign;
+} else={
+  :set Scripts $ScriptsAssign;
+}
+
+:log debug ("DHCP Server " . $leaseServerName . " " . \
+    $State . "assigned lease " . $leaseActIP . " to " . $leaseActMAC);
+
+# delay a moment to update the lease table, do not run in parallel for de/assign
+:delay ((1 + $leaseBound) . "s");
 
 :foreach Script in=$Scripts do={
   :if ([ / system script print count-only where name=$Script ] > 0) do={