diff --git a/src/ifcopenshell-python/test/util/test_selector.py b/src/ifcopenshell-python/test/util/test_selector.py
index 51c449e633..ca1ac952c9 100644
--- a/src/ifcopenshell-python/test/util/test_selector.py
+++ b/src/ifcopenshell-python/test/util/test_selector.py
@@ -20,6 +20,7 @@ import pytest
 import test.bootstrap
 import ifcopenshell.api
 import ifcopenshell.util.selector as subject
+import numpy as np
 
 
 class TestFormat():