diff --git a/tests/irf_test.py b/tests/irf_test.py
index bfe2dc3..90a1210 100644
--- a/tests/irf_test.py
+++ b/tests/irf_test.py
@@ -3,7 +3,8 @@
 
 import numpy as np
 import yaml
-from numpy.testing import assert_almost_equal, assert_array_equal, assert_array_less
+from numpy.testing import (assert_almost_equal, assert_array_equal,
+                           assert_array_less)
 
 from heat import BmiHeat