diff --git a/sources/inverter-mqtt/mqtt-init.sh b/sources/inverter-mqtt/mqtt-init.sh
index a08fbb9..dbc3dfd 100755
--- a/sources/inverter-mqtt/mqtt-init.sh
+++ b/sources/inverter-mqtt/mqtt-init.sh
@@ -55,7 +55,7 @@ registerTopic "Load_watt" "W" "chart-bell-curve"
 registerTopic "Load_watthour" "Wh" "chart-bell-curve"
 registerTopic "Load_va" "VA" "chart-bell-curve"
 registerTopic "Bus_voltage" "V" "details"
-registerTopic "Heatsink_temperature" "" "details"
+registerTopic "Heatsink_temperature" "°C" "details"
 registerTopic "Battery_capacity" "%" "battery-outline"
 registerTopic "Battery_voltage" "V" "battery-outline"
 registerTopic "Battery_charge_current" "A" "current-dc"