Index: subversion/libsvn_client/switch.c
===================================================================
--- subversion/libsvn_client/switch.c	(revision 1499976)
+++ subversion/libsvn_client/switch.c	(working copy)
@@ -239,7 +239,7 @@ switch_internal(svn_revnum_t *result_rev,
         return svn_error_createf(SVN_ERR_CLIENT_UNRELATED_RESOURCES, NULL,
                                  _("'%s' shares no common ancestry with '%s'"),
                                  switch_url,
-                                 svn_dirent_dirname(local_abspath, pool));
+                                 svn_dirent_local_style(local_abspath, pool));
     }
 
   wcroot_iprops = apr_hash_make(pool);