diff --git a/.github/workflows/markdownchecks.yml b/.github/workflows/markdownchecks.yml
index 47654e5..e85dc43 100644
--- a/.github/workflows/markdownchecks.yml
+++ b/.github/workflows/markdownchecks.yml
@@ -9,7 +9,7 @@ jobs:
   # Only on main or PR to main
   check-404-links:
     name: Check for dead links
-    if: github.ref == 'refs/heads/main' || (github.event_name == 'pull_request' && github.head_ref == 'refs/heads/main')
+    if: github.ref == 'refs/heads/main' || (github.event_name == 'pull_request' && github.event.pull_request.base.ref == 'main')
     runs-on: ubuntu-20.04
     steps:
       - name: Checkout