diff --git a/sphinxcontrib/applehelp/__init__.py b/sphinxcontrib/applehelp/__init__.py
index ddec81e..aff78f4 100644
--- a/sphinxcontrib/applehelp/__init__.py
+++ b/sphinxcontrib/applehelp/__init__.py
@@ -78,8 +78,9 @@ def init(self) -> None:
             raise SphinxError(__('You must set applehelp_bundle_id before '
                                  'building Apple Help output'))
 
-        self.bundle_path = self.outdir / (self.config.applehelp_bundle_name + '.help')
-        self.outdir = self.bundle_path.joinpath(
+        self.bundle_path = path.join(self.outdir, self.config.applehelp_bundle_name + '.help')
+        self.outdir = path.join(
+            self.bundle_path,
             'Contents',
             'Resources',
             self.config.applehelp_locale + '.lproj',