diff --git a/sphinx_book_theme/launch.py b/sphinx_book_theme/launch.py
index 95bde950..7cec0b06 100644
--- a/sphinx_book_theme/launch.py
+++ b/sphinx_book_theme/launch.py
@@ -47,7 +47,7 @@ def add_hub_urls(
         # Figure out the folders we want
         build_dir = Path(app.outdir).parent
         ntbk_dir = build_dir.joinpath("jupyter_execute")
-        sources_dir = build_dir.joinpath("html", "_sources")
+        sources_dir = build_dir.joinpath(context.get("builder", "html"), "_sources")
         # Paths to old and new notebooks
         path_ntbk = ntbk_dir.joinpath(pagename).with_suffix(".ipynb")
         path_new_notebook = sources_dir.joinpath(pagename).with_suffix(".ipynb")