diff --git a/docs/conf.py b/docs/conf.py
index d8aa118e..cd59d14d 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -29,6 +29,8 @@ class Mock(object):
     def __getattr__(self, name):
         if name in ('__file__', '__path__'):
             return '/dev/null'
+        elif name[0] == name[0].upper() and not name.startswith('MIXER_TRACK'):
+            return type(name, (), {})
         else:
             return Mock()