diff -r bb35fe8621f5 -r bcb858396233 mercurial/ui.py
--- a/mercurial/ui.py	Wed Nov 30 23:38:50 2016 +0530
+++ b/mercurial/ui.py	Wed Nov 30 23:51:11 2016 +0530
@@ -535,7 +535,7 @@
         result = self.config(section, name, untrusted=untrusted)
         if result is None:
             result = default or []
-        if isinstance(result, basestring):
+        if isinstance(result, bytes):
             result = _configlist(result.lstrip(' ,\n'))
             if result is None:
                 result = default or []