diff --git a/comparison_fixtures.py b/comparison_fixtures.py
index 4d2be8b9e083b02e5fadeef6b4f1dad1e11feb95..fa0cde627b37c0c70afa431fb26b26b12b8433b4 100644
--- a/comparison_fixtures.py
+++ b/comparison_fixtures.py
@@ -1,4 +1,4 @@
-import numpy.linalg as la
+from pytest import approx
 
 def arrays(a, b):
-    assert la.norm(a - b, 2)/la.norm(b) < 1e-5
+    assert a == approx(b)