diff --git a/Assets/VRM/UniVRM/Editor/ExporterExtensions.cs b/Assets/VRM/UniVRM/Editor/ExporterExtensions.cs
index 6416636bd..86c7445f0 100644
--- a/Assets/VRM/UniVRM/Editor/ExporterExtensions.cs
+++ b/Assets/VRM/UniVRM/Editor/ExporterExtensions.cs
@@ -1,4 +1,5 @@
 using System.Linq;
+using MeshUtility;
 using UnityEngine;
 
 namespace VRM
@@ -7,7 +8,7 @@ namespace VRM
     {
         public static bool EnableForExport(this Component mono)
         {
-            if (mono.transform.GetComponentsInParent<Transform>().Any(x => !x.gameObject.activeSelf))
+            if (mono.transform.Ancestors().Any(x => !x.gameObject.activeSelf))
             {
                 // 自分か祖先に !activeSelf がいる
                 return false;
diff --git a/Assets/VRM/UniVRM/Scripts/FirstPerson/VRMFirstPerson.cs b/Assets/VRM/UniVRM/Scripts/FirstPerson/VRMFirstPerson.cs
index b69fcc1b2..509c974db 100644
--- a/Assets/VRM/UniVRM/Scripts/FirstPerson/VRMFirstPerson.cs
+++ b/Assets/VRM/UniVRM/Scripts/FirstPerson/VRMFirstPerson.cs
@@ -195,7 +195,7 @@ namespace VRM
             var eraseBones = bones.Select((x, i) =>
             {
                 // 祖先に削除対象が存在するか
-                bool erase = x.GetComponentsInParent<Transform>().Any(y => y == eraseRoot);
+                bool erase = x.Ancestors().Any(y => y == eraseRoot);
                 return new
                 {
                     i,