diff -r f99d64e8a4e4 -r f0b6fbea00cf mercurial/url.py
--- a/mercurial/url.py	Thu Mar 22 21:19:31 2018 +0900
+++ b/mercurial/url.py	Thu Mar 22 21:56:20 2018 +0900
@@ -24,6 +24,9 @@
     urllibcompat,
     util,
 )
+from .utils import (
+    stringutil,
+)
 
 httplib = util.httplib
 stringio = util.stringio
@@ -477,7 +480,7 @@
             self.cookiejar = cookiejar
         except util.cookielib.LoadError as e:
             ui.warn(_('(error loading cookie file %s: %s; continuing without '
-                      'cookies)\n') % (cookiefile, util.forcebytestr(e)))
+                      'cookies)\n') % (cookiefile, stringutil.forcebytestr(e)))
 
     def http_request(self, request):
         if self.cookiejar: