diff --git a/homeassistant/components/device_tracker/snmp.py b/homeassistant/components/device_tracker/snmp.py
index 9981b4d7ca6..56f9eb4aae6 100644
--- a/homeassistant/components/device_tracker/snmp.py
+++ b/homeassistant/components/device_tracker/snmp.py
@@ -9,9 +9,11 @@ import logging
 import threading
 from datetime import timedelta
 
-from homeassistant.components.device_tracker import DOMAIN
+import voluptuous as vol
+
+import homeassistant.helpers.config_validation as cv
+from homeassistant.components.device_tracker import DOMAIN, PLATFORM_SCHEMA
 from homeassistant.const import CONF_HOST
-from homeassistant.helpers import validate_config
 from homeassistant.util import Throttle
 
 # Return cached results if last scan was less then this time ago.
@@ -23,15 +25,16 @@ REQUIREMENTS = ['pysnmp==4.3.2']
 CONF_COMMUNITY = "community"
 CONF_BASEOID = "baseoid"
 
+PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
+    vol.Required(CONF_HOST): cv.string,
+    vol.Required(CONF_COMMUNITY): cv.string,
+    vol.Required(CONF_BASEOID): cv.string
+})
+
 
 # pylint: disable=unused-argument
 def get_scanner(hass, config):
     """Validate the configuration and return an snmp scanner."""
-    if not validate_config(config,
-                           {DOMAIN: [CONF_HOST, CONF_COMMUNITY, CONF_BASEOID]},
-                           _LOGGER):
-        return None
-
     scanner = SnmpScanner(config[DOMAIN])
 
     return scanner if scanner.success_init else None
diff --git a/homeassistant/components/device_tracker/tomato.py b/homeassistant/components/device_tracker/tomato.py
index f5282feb733..f463c5a809d 100644
--- a/homeassistant/components/device_tracker/tomato.py
+++ b/homeassistant/components/device_tracker/tomato.py
@@ -11,10 +11,11 @@ import threading
 from datetime import timedelta
 
 import requests
+import voluptuous as vol
 
-from homeassistant.components.device_tracker import DOMAIN
+import homeassistant.helpers.config_validation as cv
+from homeassistant.components.device_tracker import DOMAIN, PLATFORM_SCHEMA
 from homeassistant.const import CONF_HOST, CONF_PASSWORD, CONF_USERNAME
-from homeassistant.helpers import validate_config
 from homeassistant.util import Throttle
 
 # Return cached results if last scan was less then this time ago.
@@ -24,15 +25,16 @@ CONF_HTTP_ID = "http_id"
 
 _LOGGER = logging.getLogger(__name__)
 
+PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
+    vol.Required(CONF_HOST): cv.string,
+    vol.Required(CONF_PASSWORD): cv.string,
+    vol.Required(CONF_USERNAME): cv.string,
+    vol.Required(CONF_HTTP_ID): cv.string
+})
+
 
 def get_scanner(hass, config):
     """Validate the configuration and returns a Tomato scanner."""
-    if not validate_config(config,
-                           {DOMAIN: [CONF_HOST, CONF_USERNAME,
-                                     CONF_PASSWORD, CONF_HTTP_ID]},
-                           _LOGGER):
-        return None
-
     return TomatoDeviceScanner(config[DOMAIN])