diff --git a/tests/test_pyg4.py b/tests/test_pyg4.py
index 2919c3b..098d3d4 100644
--- a/tests/test_pyg4.py
+++ b/tests/test_pyg4.py
@@ -1,9 +1,9 @@
-import numpy as np
 import pint
 import pyg4ometry.geant4 as g4
 
 u = pint.get_application_registry()
 
+
 def _create_dummy_mat():
     reg = g4.Registry()
     mat = g4.MaterialSingleElement("dummy", 1, 1, 1, reg)