diff --git a/homeassistant/components/apcupsd.py b/homeassistant/components/apcupsd.py
index 867208305b0..72db3e06dee 100644
--- a/homeassistant/components/apcupsd.py
+++ b/homeassistant/components/apcupsd.py
@@ -32,7 +32,7 @@ VALUE_ONLINE = 'ONLINE'
 
 CONFIG_SCHEMA = vol.Schema({
     DOMAIN: vol.Schema({
-        vol.Required(CONF_HOST, default=DEFAULT_HOST): cv.string,
+        vol.Optional(CONF_HOST, default=DEFAULT_HOST): cv.string,
         vol.Optional(CONF_PORT, default=DEFAULT_PORT): cv.port,
     }),
 }, extra=vol.ALLOW_EXTRA)