diff --git a/.github/workflows/gh_pages.yml b/.github/workflows/gh_pages.yml
index 13390544..044bec1c 100644
--- a/.github/workflows/gh_pages.yml
+++ b/.github/workflows/gh_pages.yml
@@ -28,7 +28,9 @@ jobs:
         python -m pip install --upgrade pip
         pip install sphinx sphinx-autoapi
     - name: Build docs
-      run: make html
+      run:
+        cd ./api && \
+        make html
     - name: Deploy to GitHub Pages
       uses: peaceiris/actions-gh-pages@v3
       with: