diff --git a/perception/autoware_image_projection_based_fusion/include/autoware/image_projection_based_fusion/roi_detected_object_fusion/node.hpp b/perception/autoware_image_projection_based_fusion/include/autoware/image_projection_based_fusion/roi_detected_object_fusion/node.hpp
index ea15a2df5efe2..7103537ec852d 100644
--- a/perception/autoware_image_projection_based_fusion/include/autoware/image_projection_based_fusion/roi_detected_object_fusion/node.hpp
+++ b/perception/autoware_image_projection_based_fusion/include/autoware/image_projection_based_fusion/roi_detected_object_fusion/node.hpp
@@ -57,7 +57,7 @@ class RoiDetectedObjectFusionNode
 
   void publish(const DetectedObjects & output_msg) override;
 
-  bool out_of_scope(const DetectedObject & obj);
+  bool out_of_scope(const DetectedObject & obj) override;
 
 private:
   struct