diff --git a/scripts/release.sh b/scripts/release.sh
index f276bee5c..999c2b23d 100755
--- a/scripts/release.sh
+++ b/scripts/release.sh
@@ -4,6 +4,7 @@
 # as a shell script later.
 
 echo 'git clean -xdf'
+echo 'python setup.py sdist'
 echo 'python setup.py bdist_wheel --universal'
 echo 'twine upload dist/* -r https://upload.pypi.org/legacy/ -u kubernetes'