diff --git a/custom_components/nicehash/rig_sensors.py b/custom_components/nicehash/rig_sensors.py
index 617b419..6b46b2c 100644
--- a/custom_components/nicehash/rig_sensors.py
+++ b/custom_components/nicehash/rig_sensors.py
@@ -164,7 +164,7 @@ class RigStatusSensor(Entity):
     @property
     def unit_of_measurement(self):
         """Sensor unit of measurement"""
-        return "\u200b"
+        return None
 
     @property
     def device_state_attributes(self):