diff --git a/.github/workflows/opentofu.yml b/.github/workflows/opentofu.yml
index 20a96a7..074b86d 100644
--- a/.github/workflows/opentofu.yml
+++ b/.github/workflows/opentofu.yml
@@ -58,6 +58,7 @@ jobs:
         uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           fetch-depth: 0
+          ref: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name == github.repository && github.event.pull_request.head.ref || github.sha }}
       - name: Fetch canonical pre-commit config
         id: fetch-config
         continue-on-error: true