diff --git a/mercurial/debugcommands.py b/mercurial/debugcommands.py
--- a/mercurial/debugcommands.py
+++ b/mercurial/debugcommands.py
@@ -562,7 +562,7 @@ def debugdata(ui, repo, file_, rev=None,
         raise error.CommandError('debugdata', _('invalid arguments'))
     r = cmdutil.openstorage(repo, 'debugdata', file_, opts)
     try:
-        ui.write(r.revision(r.lookup(rev), raw=True))
+        ui.write(r.rawdata(r.lookup(rev)))
     except KeyError:
         raise error.Abort(_('invalid revision identifier %s') % rev)