diff --git a/.github/workflows/autofix.yml b/.github/workflows/autofix.yml
index aabea9bc4..770475c0f 100644
--- a/.github/workflows/autofix.yml
+++ b/.github/workflows/autofix.yml
@@ -15,7 +15,7 @@ jobs:
         run: echo "$GITHUB_CONTEXT"
       - uses: actions/checkout@v4
         with:
-          ref: ${{ github.event.pull_request.head.sha }}
+          ref: ${{ github.head_ref }}
       - name: Set up Python
         uses: actions/setup-python@v5
         with: