diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 1b7ab9a1..ac7aca80 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -53,7 +53,7 @@ jobs:
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
         with:
-          ref: ${{ github.event.pull_request.head.sha || github.ref }}
+          ref: ${{ github.head_ref || github.ref }}
           repository: ${{ github.event.pull_request.head.repo.full_name || github.repository }}
           fetch-depth: 1