diff --git a/custom_components/teslemetry/binary_sensor.py b/custom_components/teslemetry/binary_sensor.py
index 3b15e33..1981743 100644
--- a/custom_components/teslemetry/binary_sensor.py
+++ b/custom_components/teslemetry/binary_sensor.py
@@ -302,7 +302,7 @@ async def async_added_to_hass(self) -> None:
         """Handle entity which will be added."""
         await super().async_added_to_hass()
         if (state := await self.async_get_last_state()) is not None:
-            self._state = state.state == "on"
+            self._attr_is_on = state.state == "on"
 
     def _async_update_attrs(self) -> None:
         """Update the attributes of the binary sensor."""