diff --git a/openmc/nuclide.py b/openmc/nuclide.py
index 7d566f2d5..33693069f 100644
--- a/openmc/nuclide.py
+++ b/openmc/nuclide.py
@@ -1,7 +1,6 @@
 from numbers import Integral
 import sys
 import warnings
-import itertools
 import openmc
 
 from six import string_types