diff --git a/homeassistant/components/homematic/sensor.py b/homeassistant/components/homematic/sensor.py
index da803b406bf..6fa78602944 100644
--- a/homeassistant/components/homematic/sensor.py
+++ b/homeassistant/components/homematic/sensor.py
@@ -62,6 +62,7 @@ HM_UNIT_HA_CAST = {
     "AIR_PRESSURE": "hPa",
     "FREQUENCY": FREQUENCY_HERTZ,
     "VALUE": "#",
+    "VALVE_STATE": UNIT_PERCENTAGE,
 }
 
 HM_DEVICE_CLASS_HA_CAST = {