diff --git a/doc/conf.py b/doc/conf.py
index f6a962746..07924c374 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -47,7 +47,7 @@
 def setup(app):
     # from sphinx.ext.autodoc import cut_lines
     # app.connect('autodoc-process-docstring', cut_lines(4, what=['module']))
-    app.add_description_unit(
+    app.add_object_type(
         "confval",
         "confval",
         objname="configuration value",