diff --git a/tools/dev-release.sh b/tools/dev-release.sh
index ffaf7881c..bd86bff44 100755
--- a/tools/dev-release.sh
+++ b/tools/dev-release.sh
@@ -49,7 +49,7 @@ done
 sed -i "s/^__version.*/__version__ = '$version'/" letsencrypt/__init__.py
 
 git add -p  # interactive user input
-git -c commit.gpgsign=true commit -m "Release $version"
+git commit --gpg-sign="$RELEASE_GPG_KEY" -m "Release $version"
 git tag --local-user "$RELEASE_GPG_KEY" \
     --sign --message "Release $version" "$tag"