--- a/hgext/win32mbcs.py	Fri May 26 19:33:20 2017 -0700
+++ b/hgext/win32mbcs.py	Wed May 31 23:44:33 2017 +0900
@@ -156,7 +156,7 @@
 # because they expects argument is local encoded string and cause
 # problem with unicode string.
 rfuncs = '''mercurial.encoding.upper mercurial.encoding.lower
- mercurial.pycompat.bytestr'''
+ mercurial.util._filenamebytestr'''
 
 # List of Windows specific functions to be wrapped.
 winfuncs = '''os.path.splitunc'''