diff --git a/testsite/group_vars/all.yml b/testsite/group_vars/all.yml
index 874b64cc4cc013cb950fe776d58bfa35e3f162f5..ac10537adf2b5a48cee78d12ab5b7caa804350bc 100644
--- a/testsite/group_vars/all.yml
+++ b/testsite/group_vars/all.yml
@@ -82,4 +82,11 @@ backup_ssh_key: "{{ lookup('file', inventory_dir + '/ssh/' + ansible_fqdn) }}"
 
 # Set-up prompt.
 prompt_colour: light_purple
-prompt_id: MAR
\ No newline at end of file
+prompt_id: MAR
+
+# Set-up NTP time synchronisation.
+ntp_servers:
+  - "0.debian.pool.ntp.org"
+  - "1.debian.pool.ntp.org"
+  - "2.debian.pool.ntp.org"
+  - "3.debian.pool.ntp.org"