diff --git a/homeassistant/components/isy994.py b/homeassistant/components/isy994.py
index f6ecebb9b2c..d3ee1008889 100644
--- a/homeassistant/components/isy994.py
+++ b/homeassistant/components/isy994.py
@@ -16,7 +16,8 @@ from homeassistant.helpers import validate_config
 from homeassistant.helpers.entity import ToggleEntity
 from homeassistant.const import (
     CONF_HOST, CONF_USERNAME, CONF_PASSWORD, EVENT_PLATFORM_DISCOVERED,
-    ATTR_SERVICE, ATTR_DISCOVERED, ATTR_FRIENDLY_NAME)
+    EVENT_HOMEASSISTANT_STOP, ATTR_SERVICE, ATTR_DISCOVERED,
+    ATTR_FRIENDLY_NAME)
 
 # homeassistant constants
 DOMAIN = "isy994"
@@ -73,6 +74,9 @@ def setup(hass, config):
     if not ISY.connected:
         return False
 
+    # listen for HA stop to disconnect
+    hass.bus.listen_once(EVENT_HOMEASSISTANT_STOP, stop)
+
     # Load components for the devices in the ISY controller that we support
     for comp_name, discovery in ((('sensor', DISCOVER_SENSORS),
                                   ('light', DISCOVER_LIGHTS),
@@ -87,6 +91,11 @@ def setup(hass, config):
     return True
 
 
+def stop(event):
+    """ Cleanup the ISY subscription. """
+    ISY.auto_update = False
+
+
 class ISYDeviceABC(ToggleEntity):
     """ Abstract Class for an ISY device within home assistant. """