diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 6744d92..37800a2 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -37,6 +37,9 @@ jobs:
     # Add a dependency to the build job
     needs: build
 
+    # Deploy only after a push to the main branch.
+    if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' }}
+
     # Grant GITHUB_TOKEN the permissions required to make a Pages deployment
     permissions:
       pages: write      # to deploy to Pages
@@ -50,9 +53,6 @@ jobs:
     # Specify runner + deployment step
     runs-on: ubuntu-latest
 
-    # Shouldn't run when the PR comes from a fork
-    if: ${{ !github.event.pull_request.head.repo.fork }}
-
     steps:
       - name: Deploy to GitHub Pages
         id: deployment