diff --git a/.github/workflows/sphinx.yaml b/.github/workflows/sphinx.yaml
index 0d498a87..3993121d 100644
--- a/.github/workflows/sphinx.yaml
+++ b/.github/workflows/sphinx.yaml
@@ -44,6 +44,8 @@ jobs:
 
   deploy:
     # Deploy to the github-pages environment
+    # but not on PRs
+    if: ${{ github.event_name != 'pull_request' }}
     environment:
       name: github-pages
       url: ${{ steps.deployment.outputs.page_url }}