diff --git a/platform/mellanox/mlnx-platform-api/sonic_platform/thermal.py b/platform/mellanox/mlnx-platform-api/sonic_platform/thermal.py
index c860edf83899..c942b0d89d35 100644
--- a/platform/mellanox/mlnx-platform-api/sonic_platform/thermal.py
+++ b/platform/mellanox/mlnx-platform-api/sonic_platform/thermal.py
@@ -80,8 +80,8 @@
 }
 thermal_api_handler_gearbox = {
     THERMAL_API_GET_TEMPERATURE:"gearbox{}_temp_input",
-    THERMAL_API_GET_HIGH_THRESHOLD:None,
-    THERMAL_API_GET_HIGH_CRITICAL_THRESHOLD:None
+    THERMAL_API_GET_HIGH_THRESHOLD:"mlxsw-gearbox{}/temp_trip_hot",
+    THERMAL_API_GET_HIGH_CRITICAL_THRESHOLD:"mlxsw-gearbox{}/temp_trip_crit"
 }
 thermal_ambient_apis = {
     THERMAL_DEV_ASIC_AMBIENT : thermal_api_handler_asic,