not needed, but consistent

selfdrive/modeld/modeld.py

@@ -16,6 +16,7 @@ from openpilot.common.realtime import config_realtime_process
 from openpilot.common.transformations.camera import DEVICE_CAMERAS
 from openpilot.common.transformations.model import get_warp_matrix
 from openpilot.system import sentry
+from openpilot.selfdrive.car.card import convert_to_capnp
 from openpilot.selfdrive.car.car_helpers import get_demo_car_params
 from openpilot.selfdrive.controls.lib.desire_helper import DesireHelper
 from openpilot.selfdrive.modeld.runners import ModelRunner, Runtime
@@ -170,7 +171,7 @@ def main(demo=False):
 
 
   if demo:
-    CP = get_demo_car_params()
+    CP = convert_to_capnp(get_demo_car_params())
   else:
     CP = messaging.log_from_bytes(params.get("CarParams", block=True), car.CarParams)