diff --git a/openmc/material.py b/openmc/material.py
index 66a6266681..dc2ab0f8bf 100644
--- a/openmc/material.py
+++ b/openmc/material.py
@@ -10,8 +10,8 @@ import warnings
 from typing import Optional, List, Union
 from xml.etree import ElementTree as ET
 
-import h5py
 import numpy as np
+import h5py
 
 import openmc
 import openmc.data