diff --git a/.github/workflows/unit-test.yml b/.github/workflows/unit-test.yml
index 08587bf7be..b25489d102 100644
--- a/.github/workflows/unit-test.yml
+++ b/.github/workflows/unit-test.yml
@@ -32,7 +32,7 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v3
         with:
-          ref: ${{ github.event.pull_request.merge_commit_sha }}
+          ref: ${{ github.event.pull_request.head.sha }}
 
       - name: docker-compose
         run: docker-compose -f test/docker-compose.yaml up -d