diff --git a/python/mujoco/bindings_test.py b/python/mujoco/bindings_test.py
index c4544d7a..16b56546 100644
--- a/python/mujoco/bindings_test.py
+++ b/python/mujoco/bindings_test.py
@@ -645,7 +645,7 @@ class MuJoCoBindingsTest(parameterized.TestCase):
 
     # Check that the res argument must have the right size.
     with self.assertRaises(TypeError):
-      mujoco.mju_rotVecQuat(np.empty(4, np.float64), vec, quat)
+      mujoco.mju_rotVecQuat(np.zeros(4, np.float64), vec, quat)
 
     # Check that the vec argument must have the right size.
     with self.assertRaises(TypeError):