diff --git a/autoware_launch/config/planning/scenario_planning/lane_driving/motion_planning/surround_obstacle_checker/surround_obstacle_checker.param.yaml b/autoware_launch/config/planning/scenario_planning/lane_driving/motion_planning/surround_obstacle_checker/surround_obstacle_checker.param.yaml
index 4ef3a456b7..ccefa54ad0 100644
--- a/autoware_launch/config/planning/scenario_planning/lane_driving/motion_planning/surround_obstacle_checker/surround_obstacle_checker.param.yaml
+++ b/autoware_launch/config/planning/scenario_planning/lane_driving/motion_planning/surround_obstacle_checker/surround_obstacle_checker.param.yaml
@@ -9,7 +9,7 @@
       surround_check_side_distance: 0.5
       surround_check_back_distance: 0.5
     unknown:
-      enable_check: false
+      enable_check: true
       surround_check_front_distance: 0.5
       surround_check_side_distance: 0.5
       surround_check_back_distance: 0.5