diff --git a/kasa/interfaces/thermostat.py b/kasa/interfaces/thermostat.py
index c5cc512c..1d2ed28b 100644
--- a/kasa/interfaces/thermostat.py
+++ b/kasa/interfaces/thermostat.py
@@ -15,6 +15,7 @@ class ThermostatState(Enum):
     Heating = "heating"
     Calibrating = "progress_calibration"
     Idle = "idle"
+    Hold = "hold_on"
     Off = "off"
     Shutdown = "shutdown"
     Unknown = "unknown"