diff --git a/homeassistant/components/demo/tts.py b/homeassistant/components/demo/tts.py
index 27c9015533e..b7be6349d98 100644
--- a/homeassistant/components/demo/tts.py
+++ b/homeassistant/components/demo/tts.py
@@ -16,7 +16,7 @@ PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
 
 def get_engine(hass, config, discovery_info=None):
     """Set up Demo speech component."""
-    return DemoProvider(config[CONF_LANG])
+    return DemoProvider(config.get(CONF_LANG, DEFAULT_LANG))
 
 
 class DemoProvider(Provider):