diff --git a/src/utils/openmc/statepoint.py b/src/utils/openmc/statepoint.py
index 7f5871023b..ad74ca1fd6 100644
--- a/src/utils/openmc/statepoint.py
+++ b/src/utils/openmc/statepoint.py
@@ -1,5 +1,6 @@
 import copy
 import struct
+import sys
 
 import numpy as np
 import scipy.stats
@@ -7,6 +8,9 @@ import scipy.stats
 import openmc
 from openmc.constants import *
 
+if sys.version > '3':
+    long = int
+
 
 class SourceSite(object):