diff --git a/notificationservice-base-v2/docker/ptptrackingfunction/trackingfunctionsdk/common/helpers/constants.py b/notificationservice-base-v2/docker/ptptrackingfunction/trackingfunctionsdk/common/helpers/constants.py
index 22c42af..2434616 100644
--- a/notificationservice-base-v2/docker/ptptrackingfunction/trackingfunctionsdk/common/helpers/constants.py
+++ b/notificationservice-base-v2/docker/ptptrackingfunction/trackingfunctionsdk/common/helpers/constants.py
@@ -29,7 +29,8 @@ TIME_IS_TRACEABLE2 = "true"
 GM_IS_PRESENT = "true"
 CLOCK_CLASS_VALUE6 = "6"
 CLOCK_CLASS_VALUE7 = "7"
-CLOCK_CLASS_LOCKED_LIST = [CLOCK_CLASS_VALUE6, CLOCK_CLASS_VALUE7]
+CLOCK_CLASS_VALUE135 = "135"
+CLOCK_CLASS_LOCKED_LIST = [CLOCK_CLASS_VALUE6, CLOCK_CLASS_VALUE7, CLOCK_CLASS_VALUE135]
 # ts2phc constants
 NMEA_SERIALPORT = "ts2phc.nmea_serialport"
 GNSS_PIN = "GNSS-1PPS"
diff --git a/notificationservice-base/docker/ptptrackingfunction/trackingfunctionsdk/common/helpers/constants.py b/notificationservice-base/docker/ptptrackingfunction/trackingfunctionsdk/common/helpers/constants.py
index 74312ca..b3347eb 100644
--- a/notificationservice-base/docker/ptptrackingfunction/trackingfunctionsdk/common/helpers/constants.py
+++ b/notificationservice-base/docker/ptptrackingfunction/trackingfunctionsdk/common/helpers/constants.py
@@ -27,7 +27,8 @@ TIME_IS_TRACEABLE2 = "true"
 GM_IS_PRESENT = "true"
 CLOCK_CLASS_VALUE6 = "6"
 CLOCK_CLASS_VALUE7 = "7"
-CLOCK_CLASS_LOCKED_LIST = [CLOCK_CLASS_VALUE6, CLOCK_CLASS_VALUE7]
+CLOCK_CLASS_VALUE135 = "135"
+CLOCK_CLASS_LOCKED_LIST = [CLOCK_CLASS_VALUE6, CLOCK_CLASS_VALUE7, CLOCK_CLASS_VALUE135]
 
 if path.exists('/ptp/linuxptp/ptpinstance'):
     LINUXPTP_CONFIG_PATH = '/ptp/linuxptp/ptpinstance/'
diff --git a/stx-ptp-notification-helm/stx-ptp-notification-helm/helm-charts/ptp-notification/values.yaml b/stx-ptp-notification-helm/stx-ptp-notification-helm/helm-charts/ptp-notification/values.yaml
index 59f95e3..20a225a 100644
--- a/stx-ptp-notification-helm/stx-ptp-notification-helm/helm-charts/ptp-notification/values.yaml
+++ b/stx-ptp-notification-helm/stx-ptp-notification-helm/helm-charts/ptp-notification/values.yaml
@@ -70,7 +70,7 @@ ptptracking:
   imagePullSecrets: default-registry-key
   ptp4lSocket: /var/run/ptp4l-ptp4l-legacy
   ptp4lServiceName: ptp4l-legacy
-  ptp4lClockClassLockedList: "6,7"
+  ptp4lClockClassLockedList: "6,7,135"
   phc2sysServiceName: phc2sys-legacy
   phc2sysComSocket: False
   logging_level: INFO
@@ -88,7 +88,7 @@ ptptrackingv2:
   imagePullSecrets: default-registry-key
   ptp4lSocket: /var/run/ptp4l-ptp4l-legacy
   ptp4lServiceName: True
-  ptp4lClockClassLockedList: "6,7"
+  ptp4lClockClassLockedList: "6,7,135"
   phc2sysServiceName: True
   phc2sysToleranceThreshold: 1000
   ts2phcServiceName: True