diff --git a/.github/workflows/assign_pr_to_project.yml b/.github/workflows/assign_pr_to_project.yml
index 92d2ff2..14e1a02 100644
--- a/.github/workflows/assign_pr_to_project.yml
+++ b/.github/workflows/assign_pr_to_project.yml
@@ -17,10 +17,11 @@ on:
 
 jobs:
   auto-assign-pr:
+    if: ${{ github.event.pull_request.head.repo.full_name == github.repository }}
     uses: ynput/ops-repo-automation/.github/workflows/pr_to_project.yml@main
     with:
       repo: "${{ github.repository }}"
-      project_id: ${{ inputs.project_id || 16 }}
-      pull_request_number: ${{ github.event.pull_request.number || inputs.pr_number }}
+      project_id: "${{ inputs.project_id }}"
+      pull_request_number: "${{ github.event.pull_request.number || inputs.pr_number }}"
     secrets:
       token: ${{ secrets.YNPUT_BOT_TOKEN }}