diff --git a/sphinx_doc_src/conf.py b/sphinx_doc_src/conf.py
index 22fe26665..808241b93 100644
--- a/sphinx_doc_src/conf.py
+++ b/sphinx_doc_src/conf.py
@@ -9,6 +9,7 @@
 import glob
 import os.path
 import pygments
+from sphinx.errors import SphinxError, SphinxWarning
 
 # -- Helper functions --------------------------------------------------------