diff --git a/boltons/funcutils.py b/boltons/funcutils.py
index 644641a..b3a3dfb 100644
--- a/boltons/funcutils.py
+++ b/boltons/funcutils.py
@@ -10,7 +10,6 @@ import sys
 import functools
 from types import MethodType, FunctionType
 from itertools import chain
-from six import iteritems
 
 
 def get_module_callables(mod, ignore=None):
@@ -50,8 +49,8 @@ def mro_items(type_obj):
     ['denominator', 'imag', 'numerator', 'real']
     """
     # TODO: handle slots?
-    return chain.from_iterable([iteritems(ct.__dict__)
-                                for ct in type_obj.__mro__])
+    return chain.from_iterable(ct.__dict__.items()
+    for ct in type_obj.__mro__)
 
 
 def dir_dict(obj, raise_exc=False):