diff --git a/homeassistant/components/notify/hangouts.py b/homeassistant/components/notify/hangouts.py
index 01f98146f4c6..7261663b99fc 100644
--- a/homeassistant/components/notify/hangouts.py
+++ b/homeassistant/components/notify/hangouts.py
@@ -9,13 +9,12 @@ import logging
 import voluptuous as vol
 
 from homeassistant.components.notify import (ATTR_TARGET, PLATFORM_SCHEMA,
-                                             NOTIFY_SERVICE_SCHEMA,
                                              BaseNotificationService,
                                              ATTR_MESSAGE, ATTR_DATA)
 
 from homeassistant.components.hangouts.const \
-    import (DOMAIN, SERVICE_SEND_MESSAGE, MESSAGE_DATA_SCHEMA,
-            TARGETS_SCHEMA, CONF_DEFAULT_CONVERSATIONS)
+    import (DOMAIN, SERVICE_SEND_MESSAGE, TARGETS_SCHEMA,
+            CONF_DEFAULT_CONVERSATIONS)
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -25,11 +24,6 @@ PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
     vol.Required(CONF_DEFAULT_CONVERSATIONS): [TARGETS_SCHEMA]
 })
 
-NOTIFY_SERVICE_SCHEMA = NOTIFY_SERVICE_SCHEMA.extend({
-    vol.Optional(ATTR_TARGET): [TARGETS_SCHEMA],
-    vol.Optional(ATTR_DATA, default={}): MESSAGE_DATA_SCHEMA
-})
-
 
 def get_service(hass, config, discovery_info=None):
     """Get the Hangouts notification service."""
@@ -61,8 +55,9 @@ class HangoutsNotificationService(BaseNotificationService):
         service_data = {
             ATTR_TARGET: target_conversations,
             ATTR_MESSAGE: messages,
-            ATTR_DATA: kwargs[ATTR_DATA]
         }
+        if kwargs[ATTR_DATA]:
+            service_data[ATTR_DATA] = kwargs[ATTR_DATA]
 
         return self.hass.services.call(
             DOMAIN, SERVICE_SEND_MESSAGE, service_data=service_data)