diff --git a/planning/behavior_path_planner/autoware_behavior_path_planner_common/include/autoware/behavior_path_planner_common/interface/scene_module_manager_interface.hpp b/planning/behavior_path_planner/autoware_behavior_path_planner_common/include/autoware/behavior_path_planner_common/interface/scene_module_manager_interface.hpp
index 746ba90b1da3d..3135bf0ee4397 100644
--- a/planning/behavior_path_planner/autoware_behavior_path_planner_common/include/autoware/behavior_path_planner_common/interface/scene_module_manager_interface.hpp
+++ b/planning/behavior_path_planner/autoware_behavior_path_planner_common/include/autoware/behavior_path_planner_common/interface/scene_module_manager_interface.hpp
@@ -206,7 +206,7 @@ class SceneModuleManagerInterface
     });
   }
 
-  bool canLaunchNewModule() const { return observers_.size() < config_.max_module_size; }
+  bool canLaunchNewModule() const { return observers_.empty(); }
 
   virtual bool isSimultaneousExecutableAsApprovedModule() const
   {