diff --git a/mercurial/cmdutil.py b/mercurial/cmdutil.py
--- a/mercurial/cmdutil.py
+++ b/mercurial/cmdutil.py
@@ -869,7 +869,7 @@
             )
             msg = (
                 _(
-                    '''Unresolved merge conflicts:
+                    b'''Unresolved merge conflicts:
 
 %s