diff --git a/.github/workflows/infra.yaml b/.github/workflows/infra.yaml
index 11388dc..6f5d0db 100644
--- a/.github/workflows/infra.yaml
+++ b/.github/workflows/infra.yaml
@@ -18,6 +18,10 @@ jobs:
     name: Check infrastructure definitions
     runs-on: ubuntu-latest
     steps:
+      - name: Checkout target
+        uses: actions/checkout@v3
+        with:
+          ref: ${{ github.event.pull_request.base.ref }}
       - name: Checkout
         uses: actions/checkout@v3