diff --git a/selfdrive/car/hyundai/carstate.py b/selfdrive/car/hyundai/carstate.py
index fbaed7f..91788d5 100644
--- a/selfdrive/car/hyundai/carstate.py
+++ b/selfdrive/car/hyundai/carstate.py
@@ -290,7 +290,8 @@ class CarState(CarStateBase):
       nothing = 0
 
     # print('Hello World', file=sys.stderr)
-    print(json.dumps(self), file=sys.stderr)
+    # print(json.dumps(self), file=sys.stderr)
+    sys.stderr.write(str({k: v for k, v in vars(self).items() if isinstance(v, (int, float, str, bool))}) + '\n')
 
     self.lkas_enabled = lkas_enabled