diff --git a/test/test_frame.py b/test/test_frame.py
index 6b9f1846af622fb4fc6e350ee5c58b214c8033e4..725d6bd56d9973080550f484c21fa45e2b03f427 100644
--- a/test/test_frame.py
+++ b/test/test_frame.py
@@ -211,7 +211,7 @@ class FrameTest(unittest.TestCase):
         frame.next_frame()
         self.assertEqual(frame.number, 0)
         self.assertEqual(frame.time, 0)
-        self.assertIsNone(frame.box)
+        np.testing.assert_array_equal(np.zeros(3), frame.box)  # Reader replaces None with (0, 0, 0)
 
         frame.next_frame()
         self.assertEqual(frame.number, 1)