diff --git a/docs/publishing-your-site.md b/docs/publishing-your-site.md
index 777f623c0..6f63504b0 100644
--- a/docs/publishing-your-site.md
+++ b/docs/publishing-your-site.md
@@ -54,6 +54,7 @@ contents:
     jobs:
       deploy:
         runs-on: ubuntu-latest
+        if: github.event.pull_request.head.repo.fork == false
         steps:
           - uses: actions/checkout@v2
           - uses: actions/setup-python@v2