diff --git a/docs/conf.py b/docs/conf.py
index 533f3fd5..52e84e06 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -35,8 +35,6 @@ class Mock(object):
             # glib.get_user_config_dir()
             return str
         elif (name[0] == name[0].upper()
-                # gst.interfaces.MIXER_TRACK_*
-                and not name.startswith('MIXER_TRACK_')
                 # gst.PadTemplate
                 and not name.startswith('PadTemplate')
                 # dbus.String()