--- a/trunk/py2exe/setup.py
+++ b/trunk/py2exe/setup.py
@@ -29,7 +29,7 @@
 
 from py2exe import __version__
 
-# $Id: setup.py 726 2013-06-05 18:42:13Z theller $
+# $Id: setup.py 731 2013-06-23 19:29:56Z theller $
 
 import sys, os, string
 from distutils.core import setup, Extension, Command
@@ -371,6 +371,8 @@
 if 'zlib' in sys.builtin_module_names:
     macros.append(("PYZLIB_BUILTIN", None))
 
+macros.append(("USE_BINARY_SEARCH", '1'))
+
 ##macros.append(("AS_PY2EXE_BUILTIN", "1")) # for runtime linking python.dll in _memimporter.c
 depends = ["source/import-tab.c", "source/import-tab.h"]