diff --git a/openmc/data/data.py b/openmc/data/data.py
index 5aadfac87..914c6c622 100644
--- a/openmc/data/data.py
+++ b/openmc/data/data.py
@@ -2,6 +2,7 @@ import itertools
 import json
 import os
 import re
+from pathlib import Path
 from math import sqrt
 from warnings import warn