diff --git a/homeassistant/components/sensor/tellstick.py b/homeassistant/components/sensor/tellstick.py
index b44e9d046664b9..464e3554324b19 100644
--- a/homeassistant/components/sensor/tellstick.py
+++ b/homeassistant/components/sensor/tellstick.py
@@ -30,7 +30,8 @@
     vol.Optional(CONF_ONLY_NAMED, default=DEFAULT_ONLY_NAMED): cv.boolean,
     vol.Optional(CONF_TEMPERATURE_SCALE, default=DEFAULT_TEMPERATURE_SCALE):
         cv.string,
-    vol.Optional(CONF_DATATYPE_MASK, default=DEFAULT_DATATYPE_MASK): cv.positive_int,
+    vol.Optional(CONF_DATATYPE_MASK, default=DEFAULT_DATATYPE_MASK):
+        cv.positive_int,
 })