diff --git a/homeassistant/components/switch/wake_on_lan.py b/homeassistant/components/switch/wake_on_lan.py
index d9f7d0ad637..ba3439dc951 100644
--- a/homeassistant/components/switch/wake_on_lan.py
+++ b/homeassistant/components/switch/wake_on_lan.py
@@ -86,10 +86,10 @@ class WOLSwitch(SwitchDevice):
         """Check if device is on and update the state."""
         if platform.system().lower() == 'windows':
             ping_cmd = ['ping', '-n', '1', '-w',
-                        str(DEFAULT_PING_TIMEOUT * 1000), self._host]
+                        str(DEFAULT_PING_TIMEOUT * 1000), str(self._host)]
         else:
             ping_cmd = ['ping', '-c', '1', '-W',
-                        str(DEFAULT_PING_TIMEOUT), self._host]
+                        str(DEFAULT_PING_TIMEOUT), str(self._host)]
 
         status = sp.call(ping_cmd, stdout=sp.DEVNULL)
         self._state = not bool(status)