diff --git a/docs/conf.py b/docs/conf.py
index 52e84e06..1eb6dd33 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -52,6 +52,7 @@ MOCK_MODULES = [
     'glib',
     'gobject',
     'gst',
+    'gst.pbutils',
     'pygst',
     'pykka',
     'pykka.actor',