diff --git a/tests/test_systemnormalizer.py b/tests/test_systemnormalizer.py
index 0276c5d..e0f4123 100644
--- a/tests/test_systemnormalizer.py
+++ b/tests/test_systemnormalizer.py
@@ -17,7 +17,7 @@
 #
 
 import pytest
-import ase
+import ase.build
 import numpy as np
 from logging import LogRecord
 import json