Pass document name as bytes.

1 files changed, 2 insertions, 2 deletions

diff --git a/sphinx/builders/html.py b/sphinx/builders/html.py
index 8d96c146..c5f7312a 100644
--- a/sphinx/builders/html.py
+++ b/sphinx/builders/html.py
@@ -35,7 +35,7 @@ from sphinx.util.osutil import SEP, os_path, relative_uri, ensuredir, \
      movefile, ustrftime, copyfile
 from sphinx.util.nodes import inline_all_toctrees
 from sphinx.util.matching import patmatch, compile_matchers
-from sphinx.util.pycompat import any
+from sphinx.util.pycompat import any, b
 from sphinx.errors import SphinxError
 from sphinx.locale import _
 from sphinx.search import js_index
@@ -199,7 +199,7 @@ class StandaloneHTMLBuilder(Builder):
         """Utility: Render a lone doctree node."""
         if node is None:
             return {'fragment': ''}
-        doc = new_document('<partial node>')
+        doc = new_document(b('<partial node>'))
         doc.append(node)
 
         if self._publisher is None: