diff --git a/.github/workflows/slack-pr-notifications.yml b/.github/workflows/slack-pr-notifications.yml
index 3521ce4..dc76632 100644
--- a/.github/workflows/slack-pr-notifications.yml
+++ b/.github/workflows/slack-pr-notifications.yml
@@ -12,6 +12,7 @@ permissions: {}
 jobs:
   notify:
     runs-on: ubuntu-latest
+    if: ${{ github.event.pull_request.head.repo.full_name == github.repository || github.event_name == 'pull_request_target' }}
     steps:
       - name: Set notification details
         id: details