--- a/mercurial/hgweb/hgwebdir_mod.py	Tue Dec 03 17:17:57 2019 -0800
+++ b/mercurial/hgweb/hgwebdir_mod.py	Thu Dec 05 11:15:19 2019 -0500
@@ -413,7 +413,7 @@
                 static = self.ui.config(b"web", b"static", untrusted=False)
                 if not static:
                     tp = self.templatepath or templater.templatepaths()
-                    if isinstance(tp, str):
+                    if isinstance(tp, bytes):
                         tp = [tp]
                     static = [os.path.join(p, b'static') for p in tp]