diff --git a/.github/workflows/test-harness.yml b/.github/workflows/test-harness.yml
index 25d849ac..ecd17c8c 100644
--- a/.github/workflows/test-harness.yml
+++ b/.github/workflows/test-harness.yml
@@ -113,6 +113,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.pull_request.head.sha || github.ref }}
 
         #look for dependencies in maven
       - name: maven-settings-xml-action