diff --git a/config/packages/devices/living_room/desk_outlet.yaml b/config/packages/devices/living_room/desk_outlet.yaml
index 75cea0e..86939a8 100644
--- a/config/packages/devices/living_room/desk_outlet.yaml
+++ b/config/packages/devices/living_room/desk_outlet.yaml
@@ -34,7 +34,6 @@ sensor:
     name: "Desk Outlet Energy total start time"
     state_topic: "tele/outlet_1/SENSOR"
     value_template: '{{ value_json.ENERGY.TotalStartTime }}'
-    device_class: timestamp
   - platform: mqtt
     name: "Desk Outlet Power"
     state_topic: "tele/outlet_1/SENSOR"