diff -r 2525c4943c09 -r 9126a4034621 mercurial/commands.py
--- a/mercurial/commands.py	Thu Aug 09 23:12:44 2018 -0400
+++ b/mercurial/commands.py	Thu Aug 09 23:13:01 2018 -0400
@@ -2625,7 +2625,7 @@
         if fm.isplain():
             formatuser = ui.shortuser
         else:
-            formatuser = str
+            formatuser = pycompat.bytestr
         if ui.quiet:
             datefmt = '%Y-%m-%d'
         else: