diff --git a/homeassistant/components/decora_wifi/light.py b/homeassistant/components/decora_wifi/light.py
index 84caf0ad29a..03cbe31b336 100644
--- a/homeassistant/components/decora_wifi/light.py
+++ b/homeassistant/components/decora_wifi/light.py
@@ -110,6 +110,11 @@ class DecoraWifiLight(LightEntity):
         """Return the display name of this switch."""
         return self._switch.name
 
+    @property
+    def unique_id(self):
+        """Return the ID of this light."""
+        return self._switch.serial
+
     @property
     def brightness(self):
         """Return the brightness of the dimmer switch."""