diff --git a/debug-level-conf/chrony.conf b/debug-level-conf/chrony.conf
index 1646b05..c82ed02 100644
--- a/debug-level-conf/chrony.conf
+++ b/debug-level-conf/chrony.conf
@@ -5,7 +5,7 @@
 # precision is how precise this is. not 1e-3 = 1 millisecond, so not very precision
 # poll 0 means poll every 2^0 seconds = 1 second poll interval
 # filter 3 means take the average/median (forget which) of the 3 most recent readings. NMEA can be jumpy so we're averaging here
-refclock SHM 0 refid NMEA offset 0.000 precision 0 poll 0 filter 3
+refclock SHM 0 refid NMEA offset 0.000 precision 1e-6 poll 0 filter 3
 
 # PPS refclock is PPS specific, with /dev/pps0 being the source
 # refid PPS means call it the PPS source