diff -r 008d37c4d783 -r 3b88a7fa97d8 setup.py
--- a/setup.py	Sat Aug 13 12:08:23 2016 +0900
+++ b/setup.py	Sat Aug 13 12:12:50 2016 +0900
@@ -624,8 +624,8 @@
     Extension('mercurial.cext.base85', ['mercurial/cext/base85.c'],
               include_dirs=common_include_dirs,
               depends=common_depends),
-    Extension('mercurial.bdiff', ['mercurial/bdiff.c',
-                                  'mercurial/bdiff_module.c'],
+    Extension('mercurial.cext.bdiff', ['mercurial/bdiff.c',
+                                       'mercurial/cext/bdiff.c'],
               include_dirs=common_include_dirs,
               depends=common_depends + ['mercurial/bdiff.h']),
     Extension('mercurial.diffhelpers', ['mercurial/diffhelpers.c'],