diff --git a/.github/workflows/benchmark.yml b/.github/workflows/benchmark.yml
index 235b8686d..013345f6f 100644
--- a/.github/workflows/benchmark.yml
+++ b/.github/workflows/benchmark.yml
@@ -62,6 +62,7 @@ jobs:
         uses: actions/checkout@v2
         with:
           fetch-depth: 0
+          ref: ${{ github.event.pull_request.head.ref }}
 
       - name: Get PR branch commit ID
         id: get_pr_commit