diff -r 4e9b39033d3f -r 86f9b25d750b mercurial/hgweb/hgwebdir_mod.py
--- a/mercurial/hgweb/hgwebdir_mod.py	Tue Jul 21 13:41:26 2020 -0700
+++ b/mercurial/hgweb/hgwebdir_mod.py	Tue Jul 21 13:36:48 2020 -0700
@@ -415,9 +415,7 @@
                 static = self.ui.config(b"web", b"static", untrusted=False)
                 if not static:
                     tp = self.templatepath or templater.templatedir()
-                    if isinstance(tp, bytes):
-                        tp = [tp]
-                    static = [os.path.join(p, b'static') for p in tp]
+                    static = [os.path.join(tp, b'static')]
 
                 staticfile(static, fname, res)
                 return res.sendresponse()