diff --git a/.github/workflows/pr.yml b/.github/workflows/pr.yml
index 968078b..62193ea 100644
--- a/.github/workflows/pr.yml
+++ b/.github/workflows/pr.yml
@@ -9,4 +9,5 @@ jobs:
       - run: |
           if [[ "${{ github.event.pull_request.head.repo.full_name }}" != "juju/juju-controller" ]]; then
             echo "::error::CI is unable to run on a PR opened from a fork. Please push your branch to the main repo and reopen this PR."
+            exit 1
           fi