diff --git a/tests/test_ml20m.py b/tests/test_ml20m.py
index f2e809b3c..95b7f0680 100644
--- a/tests/test_ml20m.py
+++ b/tests/test_ml20m.py
@@ -13,7 +13,6 @@
 from lenskit.algorithms.als import BiasedMF
 
 import pytest
-from pytest import approx
 
 _log = logging.getLogger(__name__)