diff --git a/planning/behavior_path_planner_common/src/utils/drivable_area_expansion/static_drivable_area.cpp b/planning/behavior_path_planner_common/src/utils/drivable_area_expansion/static_drivable_area.cpp
index 18627e8396239..abad804503476 100644
--- a/planning/behavior_path_planner_common/src/utils/drivable_area_expansion/static_drivable_area.cpp
+++ b/planning/behavior_path_planner_common/src/utils/drivable_area_expansion/static_drivable_area.cpp
@@ -1347,7 +1347,7 @@ std::pair<std::vector<lanelet::ConstPoint3d>, bool> getBoundWithFreeSpaceAreas(
 
       if (intersect.has_value()) {
         ret.emplace_back(
-          lanelet::InvalId, intersect.value().x, intersect.value().y, intersect.value().z);
+          lanelet::InvalId, intersect.value().x, intersect.value().y, toGeomMsgPt(bound.at(i)).z);
         break;
       }
     }