diff --git a/tests/stub_sftp.py b/tests/stub_sftp.py
index 2eb5f24..dedb78a 100644
--- a/tests/stub_sftp.py
+++ b/tests/stub_sftp.py
@@ -97,7 +97,9 @@ class StubSFTPServer (SFTPServerInterface):
             if mode is not None:
                 fd = os.open(path, flags, mode)
             else:
-                fd = os.open(path, flags)
+                # os.open() defaults to 0777 which is
+                # an odd default mode for files
+                fd = os.open(path, flags, 0666)
         except OSError, e:
             return SFTPServer.convert_errno(e.errno)
         if (flags & os.O_CREAT) and (attr is not None):