diff --git a/.github/workflows/run_foss_spec.yml b/.github/workflows/run_foss_spec.yml
index 3a6ff5f7b..395e063e7 100644
--- a/.github/workflows/run_foss_spec.yml
+++ b/.github/workflows/run_foss_spec.yml
@@ -42,7 +42,8 @@ jobs:
     steps:
     - uses: actions/checkout@v3
       with:
-        ref: ${{ github.head_ref }}
+        ref: ${{ github.event.pull_request.head.ref }}
+        repository: ${{ github.event.pull_request.head.repo.full_name }}
 
     - uses: ruby/setup-ruby@v1
       with: