diff --git a/selfdrive/car/toyota/interface.py b/selfdrive/car/toyota/interface.py
index bf9802f06e3e8d..896625e2c0e060 100755
--- a/selfdrive/car/toyota/interface.py
+++ b/selfdrive/car/toyota/interface.py
@@ -59,7 +59,7 @@ def get_params(candidate, fingerprint=gen_empty_fingerprint(), has_relay=False,
 
     if candidate == CAR.PRIUS:
       stop_and_go = True
-      ret.safetyParam = 66  # see conversion factor for STEER_TORQUE_EPS in dbc file
+      ret.safetyParam = 50  # see conversion factor for STEER_TORQUE_EPS in dbc file
       ret.wheelbase = 2.70
       ret.steerRatio = 14.22   # unknown end-to-end spec
       tire_stiffness_factor = 0.6371   # hand-tune