diff --git a/selfdrive/debug/set_car_params.py b/selfdrive/debug/set_car_params.py
index 1a5d75d7fb..bcdaed0778 100755
--- a/selfdrive/debug/set_car_params.py
+++ b/selfdrive/debug/set_car_params.py
@@ -8,4 +8,4 @@ from tools.lib.logreader import LogReader
 if __name__ == "__main__":
   r = Route(sys.argv[1])
   cp = [m for m in LogReader(r.qlog_paths()[0]) if m.which() == 'carParams']
-  Params().put("CarParams", cp[0].as_builder().to_bytes())
+  Params().put("CarParams", cp[0].carParams.as_builder().to_bytes())