diff --git a/homeassistant/components/tts/__init__.py b/homeassistant/components/tts/__init__.py
index 0e75de88cc5..d0faa60684f 100644
--- a/homeassistant/components/tts/__init__.py
+++ b/homeassistant/components/tts/__init__.py
@@ -41,7 +41,6 @@ CONF_TIME_MEMORY = 'time_memory'
 
 DEFAULT_CACHE = True
 DEFAULT_CACHE_DIR = "tts"
-DEFAULT_LANG = 'en'
 DEFAULT_TIME_MEMORY = 300
 
 SERVICE_SAY = 'say'
@@ -53,7 +52,6 @@ ATTR_CACHE = 'cache'
 _RE_VOICE_FILE = re.compile(r"([a-f0-9]{40})_([a-z]+)\.[a-z0-9]{3,4}")
 
 PLATFORM_SCHEMA = cv.PLATFORM_SCHEMA.extend({
-    vol.Optional(CONF_LANG, default=DEFAULT_LANG): cv.string,
     vol.Optional(CONF_CACHE, default=DEFAULT_CACHE): cv.boolean,
     vol.Optional(CONF_CACHE_DIR, default=DEFAULT_CACHE_DIR): cv.string,
     vol.Optional(CONF_TIME_MEMORY, default=DEFAULT_TIME_MEMORY):
@@ -79,7 +77,7 @@ def async_setup(hass, config):
         conf = config[DOMAIN][0] if len(config.get(DOMAIN, [])) > 0 else {}
         use_cache = conf.get(CONF_CACHE, DEFAULT_CACHE)
         cache_dir = conf.get(CONF_CACHE_DIR, DEFAULT_CACHE_DIR)
-        time_memory = conf.get(CONF_TIME_MEMORY, DEFAULT_LANG)
+        time_memory = conf.get(CONF_TIME_MEMORY, DEFAULT_TIME_MEMORY)
 
         yield from tts.async_init_cache(use_cache, cache_dir, time_memory)
     except (HomeAssistantError, KeyError) as err:
@@ -379,7 +377,7 @@ class Provider(object):
     """Represent a single provider."""
 
     hass = None
-    language = DEFAULT_LANG
+    language = None
 
     def get_tts_audio(self, message):
         """Load tts audio file from provider."""
diff --git a/homeassistant/components/tts/google.py b/homeassistant/components/tts/google.py
index b271b2468d1..92794cd00b6 100644
--- a/homeassistant/components/tts/google.py
+++ b/homeassistant/components/tts/google.py
@@ -10,9 +10,10 @@ import re
 
 import aiohttp
 import async_timeout
+import voluptuous as vol
 import yarl
 
-from homeassistant.components.tts import Provider
+from homeassistant.components.tts import Provider, PLATFORM_SCHEMA, CONF_LANG
 from homeassistant.helpers.aiohttp_client import async_get_clientsession
 
 REQUIREMENTS = ["gTTS-token==1.1.1"]
@@ -22,6 +23,21 @@ _LOGGER = logging.getLogger(__name__)
 GOOGLE_SPEECH_URL = "http://translate.google.com/translate_tts"
 MESSAGE_SIZE = 148
 
+SUPPORT_LANGUAGES = [
+    'af', 'sq', 'ar', 'hy', 'bn', 'ca', 'zh', 'zh-cn', 'zh-tw', 'zh-yue',
+    'hr', 'cs', 'da', 'nl', 'en', 'en-au', 'en-uk', 'en-us', 'eo', 'fi',
+    'fr', 'de', 'el', 'hi', 'hu', 'is', 'id', 'it', 'ja', 'ko', 'la', 'lv',
+    'mk', 'no', 'pl', 'pt', 'pt-br', 'ro', 'ru', 'sr', 'sk', 'es', 'es-es',
+    'es-us', 'sw', 'sv', 'ta', 'th', 'tr', 'vi', 'cy',
+]
+
+DEFAULT_LANG = 'en'
+
+
+PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
+    vol.Optional(CONF_LANG, default=DEFAULT_LANG): vol.In(SUPPORT_LANGUAGES),
+})
+
 
 @asyncio.coroutine
 def async_get_engine(hass, config):