diff --git a/src/python/m5/SimObject.py b/src/python/m5/SimObject.py
index 5a86912..7f19c07 100644
--- a/src/python/m5/SimObject.py
+++ b/src/python/m5/SimObject.py
@@ -45,6 +45,9 @@
 
 from __future__ import print_function
 from __future__ import absolute_import
+import six
+if six.PY3:
+    long = int
 
 import sys
 from types import FunctionType, MethodType, ModuleType
diff --git a/src/python/m5/params.py b/src/python/m5/params.py
index 757a4f2..ff625e0 100644
--- a/src/python/m5/params.py
+++ b/src/python/m5/params.py
@@ -60,6 +60,9 @@
 #####################################################################
 
 from __future__ import print_function
+import six
+if six.PY3:
+    long = int
 
 import copy
 import datetime
diff --git a/src/python/m5/proxy.py b/src/python/m5/proxy.py
index b939bc0..5128156 100644
--- a/src/python/m5/proxy.py
+++ b/src/python/m5/proxy.py
@@ -47,6 +47,9 @@
 
 from __future__ import print_function
 from __future__ import absolute_import
+import six
+if six.PY3:
+    long = int
 
 import copy
 
diff --git a/src/python/m5/ticks.py b/src/python/m5/ticks.py
index 22a5738..7a740a8 100644
--- a/src/python/m5/ticks.py
+++ b/src/python/m5/ticks.py
@@ -27,6 +27,9 @@
 # Authors: Nathan Binkert
 
 from __future__ import print_function
+import six
+if six.PY3:
+    long = int
 
 import sys
 from m5.util import warn
diff --git a/src/python/m5/util/convert.py b/src/python/m5/util/convert.py
index acd1a24..76ac509 100644
--- a/src/python/m5/util/convert.py
+++ b/src/python/m5/util/convert.py
@@ -28,6 +28,10 @@
 # Authors: Nathan Binkert
 #          Gabe Black
 
+import six
+if six.PY3:
+    long = int
+
 # metric prefixes
 atto  = 1.0e-18
 femto = 1.0e-15
diff --git a/src/python/m5/util/fdthelper.py b/src/python/m5/util/fdthelper.py
index bd04b41..c876050 100644
--- a/src/python/m5/util/fdthelper.py
+++ b/src/python/m5/util/fdthelper.py
@@ -35,6 +35,10 @@
 #
 # Author: Glenn Bergmans
 
+import six
+if six.PY3:
+    long = int
+
 from m5.ext.pyfdt import pyfdt
 import re
 import os
diff --git a/src/python/m5/util/smartdict.py b/src/python/m5/util/smartdict.py
index 3cfe329..dabc3f8 100644
--- a/src/python/m5/util/smartdict.py
+++ b/src/python/m5/util/smartdict.py
@@ -43,6 +43,9 @@
 
 from __future__ import print_function
 from __future__ import absolute_import
+import six
+if six.PY3:
+    long = int
 
 from .convert import *
 from .attrdict import attrdict