diff --git a/autoware_launch/config/planning/scenario_planning/lane_driving/behavior_planning/behavior_path_planner/lane_change/lane_change.param.yaml b/autoware_launch/config/planning/scenario_planning/lane_driving/behavior_planning/behavior_path_planner/lane_change/lane_change.param.yaml
index 2fa57177bd..2173370aaf 100644
--- a/autoware_launch/config/planning/scenario_planning/lane_driving/behavior_planning/behavior_path_planner/lane_change/lane_change.param.yaml
+++ b/autoware_launch/config/planning/scenario_planning/lane_driving/behavior_planning/behavior_path_planner/lane_change/lane_change.param.yaml
@@ -22,6 +22,7 @@
         lon_acc_sampling_num: 5
         lat_acc_sampling_num: 3
         lane_changing_decel_factor: 0.5
+        th_prepare_curvature: 0.03 # [/]
 
       # delay lane change
       delay_lane_change: