diff --git a/.github/workflows/format.yml b/.github/workflows/format.yml
index 756b14a..8b9d3dd 100644
--- a/.github/workflows/format.yml
+++ b/.github/workflows/format.yml
@@ -15,7 +15,8 @@ jobs:
         uses: actions/checkout@v3
         with:
           # Make sure the actual branch is checked out when running on pull requests
-          ref: ${{ github.head_ref || github.ref }}
+          ref: ${{github.event.pull_request.head.ref}}
+          repository: ${{github.event.pull_request.head.repo.full_name}}
           # This is important to fetch the changes to the previous commit
           fetch-depth: 0