diff --git a/doc/source/conf.py b/doc/source/conf.py
index a39e923f7f3..325e41b0bbd 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -54,9 +54,7 @@ sys.path.insert(0, os.path.abspath('./'))
 
 extensions = ['sphinx.ext.autodoc',
               'sphinx.ext.coverage',
-              'sphinx.ext.ifconfig',
               'sphinx.ext.graphviz',
-              'sphinx.ext.todo',
               'openstackdocstheme',
               'stevedore.sphinxext',
               'oslo_config.sphinxconfiggen',