diff --git a/autoware_launch/config/perception/object_recognition/detection/image_projection_based_fusion/roi_cluster_fusion.param.yaml b/autoware_launch/config/perception/object_recognition/detection/image_projection_based_fusion/roi_cluster_fusion.param.yaml
index 90ba841d53..016a133227 100644
--- a/autoware_launch/config/perception/object_recognition/detection/image_projection_based_fusion/roi_cluster_fusion.param.yaml
+++ b/autoware_launch/config/perception/object_recognition/detection/image_projection_based_fusion/roi_cluster_fusion.param.yaml
@@ -9,4 +9,4 @@
     roi_scale_factor: 1.1
     iou_threshold: 0.65
     unknown_iou_threshold: 0.1
-    remove_unknown: true
+    remove_unknown: false