diff --git a/armi/materials/tests/test_uZr.py b/armi/materials/tests/test_uZr.py
index 9007911af..b90fa445c 100644
--- a/armi/materials/tests/test_uZr.py
+++ b/armi/materials/tests/test_uZr.py
@@ -14,6 +14,7 @@
 
 """Tests for simplified UZr material."""
 from unittest import TestCase
+import pickle
 
 from armi.materials.uZr import UZr