diff --git a/pydrad/parse/tests/test_strand.py b/pydrad/parse/tests/test_strand.py
index c1d83ea..30b28d6 100644
--- a/pydrad/parse/tests/test_strand.py
+++ b/pydrad/parse/tests/test_strand.py
@@ -3,6 +3,7 @@
 """
 import astropy.units as u
 import h5py
+import numpy as np
 import pytest
 
 from pydrad.parse import Strand