diff --git a/homeassistant/components/mqtt/__init__.py b/homeassistant/components/mqtt/__init__.py
index e78496f1e06..07e030a8883 100644
--- a/homeassistant/components/mqtt/__init__.py
+++ b/homeassistant/components/mqtt/__init__.py
@@ -93,7 +93,7 @@ CONFIG_SCHEMA = vol.Schema({
             [PROTOCOL_31, PROTOCOL_311],
         vol.Optional(CONF_EMBEDDED): _HBMQTT_CONFIG_SCHEMA,
     }),
-})
+}, extra=vol.ALLOW_EXTRA)
 
 MQTT_BASE_PLATFORM_SCHEMA = vol.Schema({
     vol.Required(CONF_PLATFORM): DOMAIN,
diff --git a/homeassistant/components/mqtt_eventstream.py b/homeassistant/components/mqtt_eventstream.py
index d73beff725f..293b644da1f 100644
--- a/homeassistant/components/mqtt_eventstream.py
+++ b/homeassistant/components/mqtt_eventstream.py
@@ -28,7 +28,7 @@ CONFIG_SCHEMA = vol.Schema({
         vol.Optional(CONF_PUBLISH_TOPIC): valid_publish_topic,
         vol.Optional(CONF_SUBSCRIBE_TOPIC): valid_subscribe_topic,
     }),
-})
+}, extra=vol.ALLOW_EXTRA)
 
 
 def setup(hass, config):