diff --git a/.github/workflows/format-python.yml b/.github/workflows/format-python.yml
index 52856f8..d84f02f 100644
--- a/.github/workflows/format-python.yml
+++ b/.github/workflows/format-python.yml
@@ -9,6 +9,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+        with:
+          repository: ${{ github.event.pull_request.head.repo.full_name }}
+          ref: ${{ github.event.pull_request.head.ref }}
       - name: Format code with black
         run: |
           pip install black