diff --git a/py/conftest.py b/py/conftest.py
index 01ae62cb3..8fd2fadec 100644
--- a/py/conftest.py
+++ b/py/conftest.py
@@ -2,6 +2,8 @@ dist_rsync_roots = ['.'] # XXX
 
 pytest_plugins = 'pytest_doctest', 'pytest_pytester', 'pytest_restdoc'
 
+rsyncignore = ['c-extension/greenlet/build']
+
 import py
 class PylibTestPlugin:
     def pytest_addoption(self, parser):
diff --git a/py/test/config.py b/py/test/config.py
index 3d415e8e0..8695aec2f 100644
--- a/py/test/config.py
+++ b/py/test/config.py
@@ -168,7 +168,11 @@ class Config(object):
         except KeyError:
             return None
         modpath = py.path.local(mod.__file__).dirpath()
-        return [modpath.join(x, abs=True) for x in relroots]
+        l = []
+        for relroot in relroots:
+            relroot = relroot.replace("/", py.path.local.sep)
+            l.append(modpath.join(relroot, abs=True))
+        return l 
              
     def addoptions(self, groupname, *specs): 
         """ add a named group of options to the current testing session.