diff --git a/planning/autoware_obstacle_stop_planner/src/debug_marker.hpp b/planning/autoware_obstacle_stop_planner/src/debug_marker.hpp
index 1b4cdfd87f81b..ac043dd895ea7 100644
--- a/planning/autoware_obstacle_stop_planner/src/debug_marker.hpp
+++ b/planning/autoware_obstacle_stop_planner/src/debug_marker.hpp
@@ -73,12 +73,6 @@ class DebugValues
     SIZE
   };
 
-  /**
-   * @brief get the index corresponding to the given value TYPE
-   * @param [in] type the TYPE enum for which to get the index
-   * @return index of the type
-   */
-  static int getValuesIdx(const TYPE type) { return static_cast<int>(type); }
   /**
    * @brief get all the debug values as an std::array
    * @return array of all debug values