diff --git a/lib/build/sphinx_ext.py b/lib/build/sphinx_ext.py
index ca8b8216e..017f52343 100644
--- a/lib/build/sphinx_ext.py
+++ b/lib/build/sphinx_ext.py
@@ -45,7 +45,6 @@ import docutils.parsers.rst
 from docutils.parsers.rst import Directive
 
 import sphinx.errors
-import sphinx.util.compat
 import sphinx.roles
 import sphinx.addnodes