diff --git a/setup/dns.sh b/setup/dns.sh
old mode 100644
new mode 100755
index 55528a0a..3a7b1496
--- a/setup/dns.sh
+++ b/setup/dns.sh
@@ -1,3 +1,4 @@
+#!/bin/bash
 # DNS: Configure a DNS server using nsd
 #######################################
 
@@ -65,10 +66,9 @@ fi
 
 # Force the dns_update script to be run every day to re-sign zones for DNSSEC.
 cat > /etc/cron.daily/mailinabox-dnssec << EOF;
-#!/bin/bash
 # Mail-in-a-Box
 # Re-sign any DNS zones with DNSSEC because the signatures expire periodically.
-curl -d GO --user \$(</var/lib/mailinabox/api.key): http://localhost:10222/dns/update
+`pwd`/tools/dns_update
 EOF
 chmod +x /etc/cron.daily/mailinabox-dnssec