--- a/setup.py	Sat Aug 13 12:15:49 2016 +0900
+++ b/setup.py	Sat Aug 13 12:18:58 2016 +0900
@@ -631,8 +631,8 @@
     Extension('mercurial.cext.diffhelpers', ['mercurial/cext/diffhelpers.c'],
               include_dirs=common_include_dirs,
               depends=common_depends),
-    Extension('mercurial.mpatch', ['mercurial/mpatch.c',
-                                   'mercurial/mpatch_module.c'],
+    Extension('mercurial.cext.mpatch', ['mercurial/mpatch.c',
+                                        'mercurial/cext/mpatch.c'],
               include_dirs=common_include_dirs,
               depends=common_depends),
     Extension('mercurial.parsers', ['mercurial/dirs.c',