diff --git a/homeassistant/components/device_tracker/sky_hub.py b/homeassistant/components/device_tracker/sky_hub.py
index deab486ec6e..0d69e08aa71 100644
--- a/homeassistant/components/device_tracker/sky_hub.py
+++ b/homeassistant/components/device_tracker/sky_hub.py
@@ -19,7 +19,7 @@ _LOGGER = logging.getLogger(__name__)
 _MAC_REGEX = re.compile(r'(([0-9A-Fa-f]{1,2}\:){5}[0-9A-Fa-f]{1,2})')
 
 PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
-    vol.Required(CONF_HOST): cv.string
+    vol.Optional(CONF_HOST): cv.string
 })