diff --git a/.github/workflows/docs-preview-pr.yml b/.github/workflows/docs-preview-pr.yml
index ccade741..6c0672ba 100644
--- a/.github/workflows/docs-preview-pr.yml
+++ b/.github/workflows/docs-preview-pr.yml
@@ -49,6 +49,7 @@ jobs:
                   find _build -name .buildinfo -exec rm {} \;
 
             - name: Deploy preview
+              if: github.event.pull_request.head.repo.full_name == github.repository
               uses: rossjrw/pr-preview-action@v1
               with:
                   source-dir: ./_build/docs/