diff --git a/homeassistant/components/tautulli/sensor.py b/homeassistant/components/tautulli/sensor.py
index ca1651eca68..d30dafd8da4 100644
--- a/homeassistant/components/tautulli/sensor.py
+++ b/homeassistant/components/tautulli/sensor.py
@@ -119,6 +119,11 @@ class TautulliSensor(Entity):
         """Return the icon of the sensor."""
         return 'mdi:plex'
 
+    @property
+    def unit_of_measurement(self):
+        """Return the unit this state is expressed in."""
+        return "Watching"
+
     @property
     def device_state_attributes(self):
         """Return attributes for the sensor."""