diff --git a/homeassistant/components/insteon/__init__.py b/homeassistant/components/insteon/__init__.py
index 924baeaa560..b3bb6e73b94 100644
--- a/homeassistant/components/insteon/__init__.py
+++ b/homeassistant/components/insteon/__init__.py
@@ -465,6 +465,16 @@ class InsteonEntity(Entity):
         """Return the INSTEON group that the entity responds to."""
         return self._insteon_device_state.group
 
+    @property
+    def unique_id(self) -> str:
+        """Return a unique ID."""
+        if self._insteon_device_state.group == 0x01:
+            uid = self._insteon_device.id
+        else:
+            uid = '{:s}_{:d}'.format(self._insteon_device.id,
+                                     self._insteon_device_state.group)
+        return uid
+
     @property
     def name(self):
         """Return the name of the node (used for Entity_ID)."""