diff --git a/Editor/MergeArmatureHook.cs b/Editor/MergeArmatureHook.cs
index cd0d05cc..f64514d1 100644
--- a/Editor/MergeArmatureHook.cs
+++ b/Editor/MergeArmatureHook.cs
@@ -1,4 +1,4 @@
-/*
+/*
  * MIT License
  *
  * Copyright (c) 2022 bd_
@@ -116,6 +116,10 @@ namespace nadena.dev.modular_avatar.core.editor
             {
                 RetainBoneReferences(c as Component);
             }
+            foreach (var smr in avatarGameObject.transform.GetComponentsInChildren<SkinnedMeshRenderer>(true))
+            {
+                BoneDatabase.RetainMergedBone(smr.rootBone);
+            }
 
             new RetargetMeshes().OnPreprocessAvatar(avatarGameObject, BoneDatabase, PathMappings);
         }