Index: pyyaml/trunk/lib/yaml/error.py
===================================================================
--- pyyaml/trunk/lib/yaml/error.py	(revision 136)
+++ pyyaml/trunk/lib/yaml/error.py	(revision 222)
@@ -2,5 +2,5 @@
 __all__ = ['Mark', 'YAMLError', 'MarkedYAMLError']
 
-class Mark:
+class Mark(object):
 
     def __init__(self, name, index, line, column, buffer, pointer):