diff --git a/ansible/files/chrony.conf.j2 b/ansible/files/chrony.conf.j2
index 5bb9f2a..58d701b 100644
--- a/ansible/files/chrony.conf.j2
+++ b/ansible/files/chrony.conf.j2
@@ -19,10 +19,10 @@
 pool pool.ntp.infomaniak.ch iburst
 server ntp11.metas.ch
 server ntp-p1.obspm.fr
-pool 2.arch.pool.ntp.org iburst
 
 {% if ansible_hostname == "chronos" %}
 refclock PPS /dev/pps0 refid PPS
+refclock SHM 0 refid GPS poll 2 precision 1e-3 offset 0.128
 {% else %}
 server chronos.lan.k3s.fr iburst
 {% endif %}