diff --git a/src/sugar/activity/activityservice.py b/src/sugar/activity/activityservice.py
index d7a31adb..bdce898f 100644
--- a/src/sugar/activity/activityservice.py
+++ b/src/sugar/activity/activityservice.py
@@ -67,9 +67,13 @@ class ActivityService(dbus.service.Object):
         self._activity.props.active = active
 
     @dbus.service.method(_ACTIVITY_INTERFACE)
-    def Invite(self, account_path, contact_id):
+    def InviteContact(self, account_path, contact_id):
         self._activity.invite(account_path, contact_id)
 
+    @dbus.service.method(_ACTIVITY_INTERFACE)
+    def Invite(self, buddy_key):
+        raise NotImplementedError
+
     @dbus.service.method(_ACTIVITY_INTERFACE)
     def HandleViewSource(self):
         self._activity.handle_view_source()