diff --git a/pysis/binning/abstract.py b/pysis/binning/abstract.py
index b373874..436c302 100644
--- a/pysis/binning/abstract.py
+++ b/pysis/binning/abstract.py
@@ -3,6 +3,7 @@
 from collections import namedtuple
 from itertools import izip
 from abc import ABCMeta, abstractmethod
+from six.moves import range
 
 
 __all__ = [
@@ -61,7 +62,7 @@ def _iterkeys(bin):
 
     def iterbounds(self):
         """An iterator over each bins bounds."""
-        for bin_num in xrange(self.num_bins):
+        for bin_num in range(self.num_bins):
             yield self.get_bounds(bin_num)
 
     def iterbins_bounds(self):
diff --git a/pysis/binning/bounded.py b/pysis/binning/bounded.py
index 8c83e37..a8b2168 100644
--- a/pysis/binning/bounded.py
+++ b/pysis/binning/bounded.py
@@ -1,6 +1,7 @@
 # -*- coding: utf-8 -*-
 
 from bisect import bisect
+from six.moves import range
 from .abstract import AbstractBinnedKeys
 
 
@@ -19,7 +20,7 @@ def __init__(self, bounds):
         self.max_value = bounds[-1]
 
         self.num_bins = len(bounds) - 1
-        self.bins = [[] for _ in xrange(self.num_bins)]
+        self.bins = [[] for _ in range(self.num_bins)]
 
     def get_bin_index(self, value):
         """Used to get the index of the bin to place a particular value."""
diff --git a/pysis/binning/const_width.py b/pysis/binning/const_width.py
index a15e221..0df6289 100644
--- a/pysis/binning/const_width.py
+++ b/pysis/binning/const_width.py
@@ -1,6 +1,7 @@
 # -*- coding: utf-8 -*-
 
 from math import ceil
+from six.moves import range
 from .abstract import AbstractBinnedKeys
 
 
@@ -24,7 +25,7 @@ def __init__(self, min_value, max_value, num_bins=None, max_bin_size=None):
         self.num_bins = int(num_bins)
 
         self.bin_size = (self.max_value - self.min_value) / self.num_bins
-        self.bins = [[] for _ in xrange(self.num_bins)]
+        self.bins = [[] for _ in range(self.num_bins)]
 
     def get_bin_index(self, value):
         """Used to get the index of the bin to place a particular value."""
diff --git a/pysis/binning/geometric.py b/pysis/binning/geometric.py
index 70f4653..969dc03 100644
--- a/pysis/binning/geometric.py
+++ b/pysis/binning/geometric.py
@@ -1,6 +1,7 @@
 # -*- coding: utf-8 -*-
 
 from math import log, ceil
+from six.moves import range
 from .abstract import AbstractBinnedKeys
 
 
@@ -24,7 +25,7 @@ def __init__(self, min_value, max_value):
         self.max_value = pow(2.0, self.num_bins / 2.0) * self.min_value
         self.num_bins = int(self.num_bins)
 
-        self.bins = [[] for _ in xrange(self.num_bins)]
+        self.bins = [[] for _ in range(self.num_bins)]
 
     def get_bin_index(self, value):
         """Used to get the index of the bin to place a particular value."""