diff --git a/.github/workflows/check_properties.yml b/.github/workflows/check_properties.yml
index 2a7ba12b..3988e850 100644
--- a/.github/workflows/check_properties.yml
+++ b/.github/workflows/check_properties.yml
@@ -31,7 +31,7 @@ jobs:
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
           repository: ${{ github.event.pull_request.head.repo.full_name }}
-          ref: refs/pull/${{ github.event.pull_request.number }}/merge
+          ref: "${{ github.event.pull_request.merge_commit_sha }}"
           path: pr-branch
           fetch-depth: 0