diff --git a/README.md b/README.md
index 157e63f..b746c1d 100644
--- a/README.md
+++ b/README.md
@@ -15,6 +15,7 @@ Variables:
 * debianunattended_additional_packages: git nano wget bash-completion curl socat multitail python-apt-common software-properties-common
 * debianunattended_proxystring: http://hostname:port
 * debianunattended_mirror: ftp.de.debian.org
+* debianunattended_ntpserver: ntp.domain.tld
 #backup-ip-address for environment without dhcp
 * debianunattended_staticip_ipaddress: 192.168.1.42
 * debianunattended_staticip_netmask: 255.255.255.0
diff --git a/templates/preseed.cfg.j2 b/templates/preseed.cfg.j2
index 0f86b36..8015f7e 100644
--- a/templates/preseed.cfg.j2
+++ b/templates/preseed.cfg.j2
@@ -148,7 +148,11 @@ d-i time/zone string {{ debianunattended_time_zone | default('EU/Berlin') }}
 # Controls whether to use NTP to set the clock during the install
 d-i clock-setup/ntp boolean true
 # NTP server to use. The default is almost always fine here.
+{% if debianunattended_ntpserver is defined %}
+d-i clock-setup/ntp-server string {{ debianunattended_ntpserver }}
+{% else %}
 #d-i clock-setup/ntp-server string ntp.example.com
+{% endif %}
 
 ### Partitioning
 ## Partitioning example