diff --git a/.github/workflows/auto-generate-pac.yml b/.github/workflows/auto-generate-pac.yml
index 932ae4c..738c755 100644
--- a/.github/workflows/auto-generate-pac.yml
+++ b/.github/workflows/auto-generate-pac.yml
@@ -28,7 +28,7 @@ jobs:
       - name: Commit and push changes
         run: |
           last_commit_message=$(git log -1 --pretty=%B)
-          ${{ github.event_name }} == 'schedule' && commit_message="定期更新数据并生成 gfw.pac" || commit_message="自动生成 gfw.pac: $last_commit_message"
+          commit_message=$([[ "${{ github.event_name }}" == "schedule" ]] && echo "定期更新数据并生成 gfw.pac" || echo "自动生成 gfw.pac: $last_commit_message")
           git config --local user.email "action@github.com"
           git config --local user.name "GitHub Action"
           git add -A