diff -r 61ca4732399b Lib/inspect.py
--- a/Lib/inspect.py	Wed Sep 04 14:30:16 2013 +0300
+++ b/Lib/inspect.py	Wed Sep 04 19:50:37 2013 -0700
@@ -350,22 +350,22 @@ def classify_class_attrs(cls):
                 kind = "data"
             obj = obj_via_getattr
 
         result.append(Attribute(name, kind, homecls, obj))
 
     return result
 
 # ----------------------------------------------------------- class helpers
 
 def getmro(cls):
-    "Return tuple of base classes (including cls) in method resolution order."
-    return cls.__mro__
+    "Return tuple of base classes (including cls and metaclass) in method resolution order."
+    return cls.__mro__ + (type(cls), )
 
 # -------------------------------------------------------- function helpers
 
 def unwrap(func, *, stop=None):
     """Get the object wrapped by *func*.
 
    Follows the chain of :attr:`__wrapped__` attributes returning the last
    object in the chain.
 
    *stop* is an optional callback accepting an object in the wrapper chain