diff --git a/.github/workflows/preview-release.yaml b/.github/workflows/preview-release.yaml
index f0ebca63..a94e1258 100644
--- a/.github/workflows/preview-release.yaml
+++ b/.github/workflows/preview-release.yaml
@@ -67,6 +67,7 @@ jobs:
         run: |
           brew install automake bison
           echo "/usr/local/opt/bison/bin:$PATH" >> $GITHUB_PATH
+      - run: cd librubyfmt/ruby_checkout && make clean
       - run: ./script/make_release
       - uses: actions/upload-artifact@v3
         with: