diff --git a/src/zfec/ez_setup.py b/src/zfec/ez_setup.py
index 2d60a4799..364cbc906 100644
--- a/src/zfec/ez_setup.py
+++ b/src/zfec/ez_setup.py
@@ -15,7 +15,7 @@ This file can also be run as a script to install or upgrade setuptools.
 """
 import sys
 
-DEFAULT_VERSION = "0.6c5"
+DEFAULT_VERSION = "0.6c6"
 DEFAULT_URL     = "http://cheeseshop.python.org/packages/%s/s/setuptools/" % sys.version[:3]
 
 md5_data = {
@@ -40,6 +40,7 @@ md5_data = {
     'setuptools-0.6c5-py2.3.egg': 'ee9fd80965da04f2f3e6b3576e9d8167',
     'setuptools-0.6c5-py2.4.egg': 'afe2adf1c01701ee841761f5bcd8aa64',
     'setuptools-0.6c5-py2.5.egg': 'a8d3f61494ccaa8714dfed37bccd3d5d',
+    'setuptools-0.6c6-py2.5.egg': 'b2f8a7520709a5b34f80946de5f02f53',
 }
 
 import sys, os
diff --git a/src/zfec/setup.py b/src/zfec/setup.py
index a8c08d839..24a16e35a 100644
--- a/src/zfec/setup.py
+++ b/src/zfec/setup.py
@@ -20,7 +20,12 @@
 # http://allmydata.com/.
 
 from ez_setup import use_setuptools
-use_setuptools(min_version='0.6a9')
+import sys
+if 'cygwin' in sys.platform.lower():
+    min_version='0.6c6'
+else:
+    min_version='0.6a9'
+use_setuptools(min_version=min_version)
 
 from setuptools import Extension, find_packages, setup