diff --git a/check_timesync b/check_timesync
index 4ac54f8cc544820d2ee4970f5ebada21bf00991a..70f3870cd8835388f1b6763863adcb4a41d19afe 100755
--- a/check_timesync
+++ b/check_timesync
@@ -14,6 +14,8 @@
 # 2018-10-26  v1.0  <axel.hahn@iml.unibe.ch>
 # 2020-03-05  v1.1  <axel.hahn@iml.unibe.ch> switch to ph.* helper functions
 # 2020-05-13  v1.2  <axel.hahn@iml.unibe.ch> update pre detect output of timedatectl
+# 2021-08-19  v1.3  <martin.gasser@iml.unibe.ch> update for chrony with timedatectl 
+
 # ======================================================================
 
 . `dirname $0`/inc_pluginfunctions
@@ -36,16 +38,16 @@ fi
 # ph.execIfReady "timedatectl status | grep '^NTP synchronized'" >/dev/null
 # echo ----- output of timedatectl status >$tmpfile
 # timedatectl status >>$tmpfile
-ph.execIfReady "timedatectl status >$tmpfile; grep '^NTP synchronized' $tmpfile >/dev/null"
+ph.execIfReady "timedatectl show >$tmpfile; grep '^NTPSynchronized' $tmpfile >/dev/null"
 
-cat $tmpfile | grep "^NTP synchronized" >/dev/null
+cat $tmpfile | grep "^NTPSynchronized" >/dev/null
 if [ $? -ne 0 ]; then
   ph.setStatus "unknown"
   # ph.status "timesync: timedatectl has no line NTP synchronized ... maybe your OS ${myos} is not supported"
   ph.status "timesync: timedatectl has no line NTP synchronized"
   cat $tmpfile
 else
-  cat $tmpfile | grep "^NTP synchronized: yes" >/dev/null
+  cat $tmpfile | grep "^NTPSynchronized=yes" >/dev/null
   if [ $? -eq 0 ]; then
     ph.status "timesync: a timesync service is active on this ${myos} host"
   else
@@ -66,6 +68,9 @@ fi
 if [ -f /etc/chrony.conf ]; then
   sSyncService="chronyd"
 fi
+if [ -f /etc/chrony/chrony.conf ]; then
+  sSyncService="chronyd"
+fi
 if [ -z $sSyncService ]; then
   echo "REMARK: no sync service detected ... or this sensu check does not support it" >>$tmpfile
 else
@@ -78,7 +83,7 @@ fi
 # output & exit
 # ----------------------------------------------------------------------
 
-cat $tmpfile | grep "^NTP synchronized"
+cat $tmpfile | grep "^NTPSynchronized"
 echo
 cat $tmpfile
 
@@ -86,4 +91,4 @@ rm -f $tmpfile
 
 ph.exit
 
-# ----------------------------------------------------------------------
+# ----------------------------------------------------------------------
\ No newline at end of file