diff --git a/roles/base/defaults/main.yml b/roles/base/defaults/main.yml
index 2611d01..0d143f1 100644
--- a/roles/base/defaults/main.yml
+++ b/roles/base/defaults/main.yml
@@ -12,6 +12,10 @@ recursive_dns_servers:
 recursive_dns_search_domains:
   - "{{ local_domain }}"
 
+ntp_servers:
+  - time.nrc.ca
+  - time.chu.nrc.ca
+
 grub_cmdline: "console=tty0 console=ttyS{{ grub.serial_console[cluster_hardware].console }},115200 plymouth.ignore-serial-consoles splash"
 grub_serial: "serial --unit={{ grub.serial_console[cluster_hardware].console }} --speed=115200"
 
diff --git a/roles/base/templates/etc/ntp.conf.j2 b/roles/base/templates/etc/ntp.conf.j2
index 638c6bc..a843cae 100644
--- a/roles/base/templates/etc/ntp.conf.j2
+++ b/roles/base/templates/etc/ntp.conf.j2
@@ -16,9 +16,10 @@ tos orphan 6
 server 127.0.0.1
 fudge  127.0.0.1 stratum 10
 
-# NRC public NTP masters
-server time.nrc.ca iburst
-server time.chu.nrc.ca iburst
+# NTP masters
+{% for server in ntp_servers %}
+server {{ server }} iburst
+{% endfor %}
 
 # Local PVC cluster
 {% for host in groups[cluster_group] %}