diff --git a/.github/workflows/build_documentation.yaml b/.github/workflows/build_documentation.yaml
index 52afaf4f..e567fb18 100644
--- a/.github/workflows/build_documentation.yaml
+++ b/.github/workflows/build_documentation.yaml
@@ -32,7 +32,7 @@ jobs:
         run: |
           pip install .
           sphinx-multiversion docs/source docs/build/html
-          cp docs/build/html ./_site
+          cp -r docs/build/html ./_site
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v3