diff --git a/homeassistant/components/whois/sensor.py b/homeassistant/components/whois/sensor.py
index 7ec5c3dac5e..0e3c0c6e0da 100644
--- a/homeassistant/components/whois/sensor.py
+++ b/homeassistant/components/whois/sensor.py
@@ -6,14 +6,12 @@ import voluptuous as vol
 import whois
 
 from homeassistant.components.sensor import PLATFORM_SCHEMA
-from homeassistant.const import CONF_NAME, TIME_DAYS
+from homeassistant.const import CONF_DOMAIN, CONF_NAME, TIME_DAYS
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.entity import Entity
 
 _LOGGER = logging.getLogger(__name__)
 
-CONF_DOMAIN = "domain"
-
 DEFAULT_NAME = "Whois"
 
 ATTR_EXPIRES = "expires"