diff --git a/.github/workflows/auto-assign-author.yml b/.github/workflows/auto-assign-author.yml
index 0e861df004..13c93c717e 100644
--- a/.github/workflows/auto-assign-author.yml
+++ b/.github/workflows/auto-assign-author.yml
@@ -6,6 +6,7 @@ on:
 jobs:
   assign-author:
     runs-on: ubuntu-latest
+    if: ${{ github.event.pull_request.head.repo.full_name == github.repository }}
     permissions:
       pull-requests: write
     steps: