diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index a7f5bb9dc363..7b118d6ed268 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -81,6 +81,8 @@ jobs:
 
     - name: Checkout sources
       uses: actions/checkout@v2
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
 
     - name: Setup maven cache
       uses: actions/cache@v2