diff --git a/doc/source/conf.py b/doc/source/conf.py
index d77ea07b7e2a9..2cbe79428e1cf 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -16,6 +16,7 @@
 import os
 import sys
 import warnings
+import re
 
 import jinja2
 from numpydoc.docscrape import NumpyDocString