diff --git a/mercurial/debugcommands.py b/mercurial/debugcommands.py
--- a/mercurial/debugcommands.py
+++ b/mercurial/debugcommands.py
@@ -2663,7 +2663,7 @@
         for key, value in sidedata:
             ui.write((' entry-%04o size %d\n' % (key, len(value))))
             if ui.verbose:
-                ui.write(('  %s\n' % repr(value)))
+                ui.write(('  %s\n' % stringutil.pprint(value)))
 
 @command('debugssl', [], '[SOURCE]', optionalrepo=True)
 def debugssl(ui, repo, source=None, **opts):