diff --git a/Assets/VRM/Runtime/IO/VRMData.cs b/Assets/VRM/Runtime/IO/VRMData.cs
index 658f45a5b..84e85eb82 100644
--- a/Assets/VRM/Runtime/IO/VRMData.cs
+++ b/Assets/VRM/Runtime/IO/VRMData.cs
@@ -5,7 +5,7 @@ namespace VRM
     public class VRMData
     {
         public GltfData Data { get; }
-        public glTF_VRM_extensions VrmExtensions { get; }
+        public glTF_VRM_extensions VrmExtension { get; }
 
         public VRMData(GltfData data)
         {
@@ -15,7 +15,7 @@ namespace VRM
             {
                 throw new NotVrm0Exception();
             }
-            VrmExtensions = vrm;
+            VrmExtension = vrm;
         }
     }
 }
diff --git a/Assets/VRM/Runtime/IO/VRMImporterContext.cs b/Assets/VRM/Runtime/IO/VRMImporterContext.cs
index c085f6bd6..889dd7892 100644
--- a/Assets/VRM/Runtime/IO/VRMImporterContext.cs
+++ b/Assets/VRM/Runtime/IO/VRMImporterContext.cs
@@ -17,7 +17,7 @@ namespace VRM
         {
             get
             {
-                return _data.VrmExtensions;
+                return _data.VrmExtension;
             }
         }
 
@@ -26,7 +26,7 @@ namespace VRM
             IReadOnlyDictionary<SubAssetKey, Object> externalObjectMap = null,
             ITextureDeserializer textureDeserializer = null,
             IMaterialDescriptorGenerator materialGenerator = null)
-            : base(data.Data, externalObjectMap, textureDeserializer, materialGenerator ?? new VRMMaterialDescriptorGenerator(data.VrmExtensions))
+            : base(data.Data, externalObjectMap, textureDeserializer, materialGenerator ?? new VRMMaterialDescriptorGenerator(data.VrmExtension))
         {
             _data = data;
             TextureDescriptorGenerator = new VrmTextureDescriptorGenerator(Data, VRM);
diff --git a/Assets/VRM/Samples/SimpleViewer/ViewerUI.cs b/Assets/VRM/Samples/SimpleViewer/ViewerUI.cs
index d4436d723..1811c3cc8 100644
--- a/Assets/VRM/Samples/SimpleViewer/ViewerUI.cs
+++ b/Assets/VRM/Samples/SimpleViewer/ViewerUI.cs
@@ -364,7 +364,7 @@ namespace VRM.SimpleViewer
                     {
                         var data = new GlbFileParser(path).Parse();
                         var vrm = new VRMData(data);
-                        using (var context = new VRMImporterContext(vrm, materialGenerator: GetVrmMaterialGenerator(m_useUrpMaterial.isOn, vrm.VrmExtensions)))
+                        using (var context = new VRMImporterContext(vrm, materialGenerator: GetVrmMaterialGenerator(m_useUrpMaterial.isOn, vrm.VrmExtension)))
                         {
                             await m_texts.UpdateMetaAsync(context);
                             var loaded = await context.LoadAsync();