diff --git a/.github/workflows/build_docs.yml b/.github/workflows/build_docs.yml
index e91b0782c..d79b73cf1 100644
--- a/.github/workflows/build_docs.yml
+++ b/.github/workflows/build_docs.yml
@@ -28,6 +28,7 @@ jobs:
       - name: Build
         run: sphinx-build docs ./public
       - name: Deploy
+        if: ${{ github.ref == 'refs/heads/sources' && github.repository == 'Symengine/symengine.github.io' }}
         uses: peaceiris/actions-gh-pages@v3
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}