diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index c4c89746..6889272a 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -24,7 +24,7 @@ jobs:
           pip install sphinx sphinx_rtd_theme myst_parser piccolo_theme
       - name: Sphinx build
         run: |
-          sphinx-build doc _build
+          sphinx-build doc/source _build
       - name: Deploy to GitHub Pages
         uses: peaceiris/actions-gh-pages@v3
         with: