diff --git a/debug-level-conf/50-tty.rules b/debug-level-conf/50-tty.rules
index 9c16d1e..05e3341 100644
--- a/debug-level-conf/50-tty.rules
+++ b/debug-level-conf/50-tty.rules
@@ -2,4 +2,4 @@ SUBSYSTEM=="pps[0-9]*", GROUP="dialout", MODE="0660"
 SUBSYSTEM=="tty[0-9]*", GROUP="dialout", MODE="0660"
 SUBSYSTEM=="tty[A-Z]*[0-9]*", GROUP="dialout", MODE="0660"
 SUBSYSTEM=="i2c[A-Z]-*[0-9]*", GROUP="dialout", MODE="0660"
-SUBSYSTEM=="rtc[0-9]*", GROUP="dialout", MODE="0660"
\ No newline at end of file
+SUBSYSTEM=="rtc[0-9]?*", GROUP="dialout", MODE="0660"
\ No newline at end of file
diff --git a/debug-level-conf/chrony.conf b/debug-level-conf/chrony.conf
index 1d371f8..22f205e 100644
--- a/debug-level-conf/chrony.conf
+++ b/debug-level-conf/chrony.conf
@@ -16,7 +16,7 @@ refclock SHM 0 refid NMEA offset 0.000 precision 1e-3 poll 0 filter 3
 refclock PPS /dev/pps0 refid PPS lock NMEA offset 0.0 poll 3 trust
 
 # enable RTC refclock
-refclock PHC /dev/rtc poll 3 offset 0
+refclock PHC /dev/rtc0 poll 2 offset 0
 
 # also enable logging by uncommenting the logging line
 log tracking measurements statistics