diff --git a/python/LQR.ipynb b/python/LQR.ipynb
index 696828ae..67114c01 100644
--- a/python/LQR.ipynb
+++ b/python/LQR.ipynb
@@ -226,7 +226,7 @@
         "    if not isinstance(camera, mujoco.MjvCamera):\n",
         "      camera_id = camera\n",
         "      if isinstance(camera_id, str):\n",
-        "        camera_id = _model.camera(camera_id).id\n",
+        "        camera_id = self._model.camera(camera_id).id\n",
         "      if camera_id \u003c -1:\n",
         "        raise ValueError('camera_id cannot be smaller than -1.')\n",
         "      if camera_id \u003e= self._model.ncam:\n",