diff --git a/sphinx_book_theme/launch.py b/sphinx_book_theme/launch.py
index 7cec0b06..86da7465 100644
--- a/sphinx_book_theme/launch.py
+++ b/sphinx_book_theme/launch.py
@@ -45,9 +45,10 @@ def add_hub_urls(
         or context["sourcename"].endswith(".md.txt")
     ):
         # Figure out the folders we want
-        build_dir = Path(app.outdir).parent
+        out_dir = Path(app.outdir)
+        build_dir = out_dir.parent
         ntbk_dir = build_dir.joinpath("jupyter_execute")
-        sources_dir = build_dir.joinpath(context.get("builder", "html"), "_sources")
+        sources_dir = out_dir.joinpath("_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")
diff --git a/tests/test_build.py b/tests/test_build.py
index 6301de90..db2ca096 100644
--- a/tests/test_build.py
+++ b/tests/test_build.py
@@ -302,3 +302,12 @@ def test_logo_only(sphinx_build_factory):
         "h1", attrs={"id": "site-title"}
     )
     assert not logo_text
+
+
+def test_copy_rendered_notebooks():
+    target = Path("build/outdir/_sources/section1/ntbkmd.ipynb")
+    if target.exists():
+        target.unlink()
+    # Switch to sphinx_build_factory if we figure out how to use outdir w/ it
+    check_call("sphinx-build -W -b dirhtml tests/sites/base build/outdir", shell=True)
+    assert target.exists()