diff --git a/.github/workflows/preview-release.yaml b/.github/workflows/preview-release.yaml
index bcc4e24f..6becb54c 100644
--- a/.github/workflows/preview-release.yaml
+++ b/.github/workflows/preview-release.yaml
@@ -98,7 +98,7 @@ jobs:
           name: rubyfmt-release-artifact-macos-latest-native
       - id: vars
         run: |
-          echo tag_name=${{github.ref}}-${git rev-list --count HEAD} >> $GITHUB_OUTPUT
+          echo tag_name=${{github.ref}}-$(git rev-list --count HEAD) >> $GITHUB_OUTPUT
     #   - name: Ship It 🚢
     #     uses: softprops/action-gh-release@v1
     #     with: