diff --git a/docs/conf.py b/docs/conf.py
index f36b854..b859cf4 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -291,6 +291,9 @@
 # If true, do not generate a @detailmenu in the "Top" node's menu.
 #texinfo_no_detailmenu = False
 
+from docutils import nodes
+from sphinx.util.compat import Directive
+
 class Disqus(Directive):
     required_arguments = 2
     optional_arguments = 0