diff --git a/mopidy_musicbox_webclient/__init__.py b/mopidy_musicbox_webclient/__init__.py
index b32e515..14bfac2 100644
--- a/mopidy_musicbox_webclient/__init__.py
+++ b/mopidy_musicbox_webclient/__init__.py
@@ -19,7 +19,7 @@ class MusicBoxExtension(ext.Extension):
 
     def get_config_schema(self):
         schema = super(MusicBoxExtension, self).get_config_schema()
-        schema['musicbox'] = config.Boolean()
+        schema['musicbox'] = config.Boolean(optional=True)
         schema['websocket_host'] = config.Hostname(optional=True)
         schema['websocket_port'] = config.Port(optional=True)
         return schema
diff --git a/mopidy_musicbox_webclient/web.py b/mopidy_musicbox_webclient/web.py
index 64c0870..8cf3df0 100644
--- a/mopidy_musicbox_webclient/web.py
+++ b/mopidy_musicbox_webclient/web.py
@@ -44,7 +44,7 @@ class IndexHandler(tornado.web.RequestHandler):
 
         self.__dict = {
             'version': MusicBoxExtension.version,
-            'musicbox': int(ext_config['musicbox']),
+            'musicbox': int(ext_config['musicbox'] or False),
             'websocket_url': ws_url
         }
         self.__path = path