diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 0d666667..8f5b2d93 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -110,7 +110,7 @@ jobs:
       - name: "Checkout"
         uses: actions/checkout@v4
         with:
-          ref: ${{github.event.pull_request.head.ref}}
+          ref: ${{github.event.pull_request.head.sha}}
           repository: ${{github.event.pull_request.head.repo.full_name}}
           fetch-depth: 0