diff --git a/python/mujoco/rollout_test.py b/python/mujoco/rollout_test.py
index 25689a68..23139ba8 100644
--- a/python/mujoco/rollout_test.py
+++ b/python/mujoco/rollout_test.py
@@ -532,7 +532,7 @@ class MuJoCoRolloutTest(parameterized.TestCase):
     sensordata = np.empty((nroll, nstep, model.nsensordata))
     control = np.random.randn(nroll, nstep, model.nu)
 
-    model_list = [model] * nroll
+    model_list = [copy.copy(model) for _ in range(nroll)]
     data_list = [mujoco.MjData(model) for _ in range(num_workers)]
 
     rollout.rollout(
@@ -561,7 +561,7 @@ class MuJoCoRolloutTest(parameterized.TestCase):
     sensordata = np.empty((nroll, nstep, model.nsensordata))
     control = np.random.randn(nroll, nstep, model.nu)
 
-    model_list = [model] * nroll
+    model_list = [copy.copy(model) for _ in range(nroll)]
     data_list = [mujoco.MjData(model) for _ in range(num_workers)]
 
     with rollout.Rollout(nthread=num_workers) as rollout_:
@@ -610,7 +610,7 @@ class MuJoCoRolloutTest(parameterized.TestCase):
     sensordata = np.empty((nroll, nstep, model.nsensordata))
     control = np.random.randn(nroll, nstep, model.nu)
 
-    model_list = [model] * nroll
+    model_list = [copy.copy(model) for _ in range(nroll)]
     data_list = [mujoco.MjData(model) for _ in range(num_workers)]
 
     for _ in range(2):
@@ -871,7 +871,7 @@ def py_rollout(
   nstep = control.shape[1]
 
   if isinstance(model, mujoco.MjModel):
-    model = [model] * nroll
+    model = [copy.copy(model) for _ in range(nroll)]
 
   nstate = mujoco.mj_stateSize(model[0], mujoco.mjtState.mjSTATE_FULLPHYSICS)