diff --git a/Assets/VRM10/Runtime/IO/Vrm10Data.cs b/Assets/VRM10/Runtime/IO/Vrm10Data.cs
index 4e1168e32..9ad29fcea 100644
--- a/Assets/VRM10/Runtime/IO/Vrm10Data.cs
+++ b/Assets/VRM10/Runtime/IO/Vrm10Data.cs
@@ -18,7 +18,7 @@ namespace UniVRM10
     {
         public GltfData Data { get; }
         public UniGLTF.Extensions.VRMC_vrm.VRMC_vrm VrmExtension { get; }
-        public readonly Migration.Vrm0Meta OldMeta;
+        public readonly Migration.Vrm0Meta OriginalMetaBeforeMigration;
         public readonly Vrm10FileType FileType;
         public readonly String Message;
 
@@ -28,7 +28,7 @@ namespace UniVRM10
             VrmExtension = vrm;
             FileType = fileType;
             Message = message;
-            OldMeta = oldMeta;
+            OriginalMetaBeforeMigration = oldMeta;
         }
 
         public static bool TryParseOrMigrate(string path, bool doMigrate, out Vrm10Data result)
diff --git a/Assets/VRM10/Samples/VRM10Viewer/VRM10ViewerUI.cs b/Assets/VRM10/Samples/VRM10Viewer/VRM10ViewerUI.cs
index 3b3e520e7..6d29bf617 100644
--- a/Assets/VRM10/Samples/VRM10Viewer/VRM10ViewerUI.cs
+++ b/Assets/VRM10/Samples/VRM10Viewer/VRM10ViewerUI.cs
@@ -441,10 +441,10 @@ namespace UniVRM10.VRM10Viewer
                     // migrate しても thumbnail は同じ
                     var thumbnail = await loader.LoadVrmThumbnailAsync();
 
-                    if (vrm.OldMeta != null)
+                    if (vrm.OriginalMetaBeforeMigration != null)
                     {
                         // migrated from vrm-0.x. use OldMeta
-                        m_texts.UpdateMeta(vrm.OldMeta, thumbnail);
+                        m_texts.UpdateMeta(vrm.OriginalMetaBeforeMigration, thumbnail);
                     }
                     else
                     {