diff --git a/tests/test_utils_npy.py b/tests/test_utils_npy.py
index c5dc05c8d..b8277d139 100644
--- a/tests/test_utils_npy.py
+++ b/tests/test_utils_npy.py
@@ -35,8 +35,8 @@ def test_nice_linspace(start, stop, num, expected):
     (-2, 2, 2, True, np.array([-2., 0., 2.])),                 # symmetric around 0
     (0, 5, 2, True, np.array([0., 2., 4.])),                   # basic
     (0, 5, 2, False, np.array([0., 2.])),                      # no endpoint
-    (-1, 2, 1.5, True, np.array([-1.5, 0., 1.5]))              # step doesn't fit exactly
-    (-1,  2, -1.5,  True,  np.array([-1.5, 0., 1.5])),
+    (-1, 2, 1.5, True, [-1.5, 0., 1.5])              # step doesn't fit exactly
+    (-1,  2, -1.5,  True,  [-1.5, 0., 1.5]),
     ( 5,  0,  -2,   True,  np.array([ 4.,  2.,  0.])),
 
 ])