diff --git a/.github/workflows/check-system-print.yml b/.github/workflows/check-system-print.yml
index 60b3e9b81..8dfa0760e 100644
--- a/.github/workflows/check-system-print.yml
+++ b/.github/workflows/check-system-print.yml
@@ -9,6 +9,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v2
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
 
       - name: Setup reviewdog
         uses: reviewdog/action-setup@v1