diff --git a/homeassistant/components/sensor/systemmonitor.py b/homeassistant/components/sensor/systemmonitor.py
index ea8595e3991..2cc76e55ef4 100644
--- a/homeassistant/components/sensor/systemmonitor.py
+++ b/homeassistant/components/sensor/systemmonitor.py
@@ -92,6 +92,11 @@ class SystemMonitorSensor(Entity):
         self._state = None
         self._unit_of_measurement = SENSOR_TYPES[sensor_type][1]
 
+    @property
+    def unique_id(self):
+        """Return a unique identifier for the sensor."""
+        return self.type
+
     @property
     def name(self):
         """Return the name of the sensor."""