diff --git a/setup.py b/setup.py
index 4bf6c808..62020ca2 100755
--- a/setup.py
+++ b/setup.py
@@ -271,6 +271,7 @@ class Setup():
             else:
                 conf = self.configure(opts.opts)
                 self.viewconf(conf)
+                os.umask(0o77)
 
                 if method == 'build':
                     self.build(conf)