--- a/mercurial/ui.py	Sat Apr 04 22:30:59 2015 +0900
+++ b/mercurial/ui.py	Tue Mar 24 21:25:57 2015 +0100
@@ -158,7 +158,7 @@
 
         if self.plain():
             for k in ('debug', 'fallbackencoding', 'quiet', 'slash',
-                      'logtemplate', 'style',
+                      'logtemplate', 'statuscopies', 'style',
                       'traceback', 'verbose'):
                 if k in cfg['ui']:
                     del cfg['ui'][k]