diff -r 05a16c19967e -r 2dcb3d52ef41 mercurial/pure/mpatch.py
--- a/mercurial/pure/mpatch.py	Tue May 02 21:04:40 2017 +0900
+++ b/mercurial/pure/mpatch.py	Tue May 02 21:08:38 2017 +0900
@@ -130,7 +130,7 @@
 
 if modulepolicy not in policynocffi:
     try:
-        from _mpatch_cffi import ffi, lib
+        from ..cffi._mpatch import ffi, lib
     except ImportError:
         if modulepolicy == 'cffi': # strict cffi import
             raise