diff --git a/selfdrive/car/hyundai/carstate.py b/selfdrive/car/hyundai/carstate.py
index 285490d..fbaed7f 100644
--- a/selfdrive/car/hyundai/carstate.py
+++ b/selfdrive/car/hyundai/carstate.py
@@ -1,7 +1,9 @@
 from collections import deque
 import copy
 import math
+
 import sys
+import json
 
 from cereal import car
 from openpilot.common.conversions import Conversions as CV
@@ -287,8 +289,8 @@ class CarState(CarStateBase):
     except:
       nothing = 0
 
-    print('Hello World', file=sys.stderr)
-    print(self, file=sys.stderr)
+    # print('Hello World', file=sys.stderr)
+    print(json.dumps(self), file=sys.stderr)
 
     self.lkas_enabled = lkas_enabled