diff --git a/Assets/VRM/UniGLTF/Editor/Serialization/SerializerGenerator.cs b/Assets/VRM/UniGLTF/Editor/Serialization/SerializerGenerator.cs
index b0da0f38a..fbde88225 100644
--- a/Assets/VRM/UniGLTF/Editor/Serialization/SerializerGenerator.cs
+++ b/Assets/VRM/UniGLTF/Editor/Serialization/SerializerGenerator.cs
@@ -253,6 +253,10 @@ namespace UniGLTF {
                         if (fi.FieldType == typeof(string) || fi.FieldType.IsEnum || fi.FieldType.IsArray || fi.FieldType.IsGenericType)
                         {
 
+                        }
+                        else if(fi.FieldType == typeof(glTF_KHR_materials_unlit))
+                        {
+
                         }
                         else if (fi.FieldType.IsClass && fi.FieldType.GetFields(FIELD_FLAGS).Length == 0)
                         {
diff --git a/Assets/VRM/UniGLTF/Scripts/IO/FormatterExtensionsGltf.g.cs b/Assets/VRM/UniGLTF/Scripts/IO/FormatterExtensionsGltf.g.cs
index e1174d347..bec719f4c 100644
--- a/Assets/VRM/UniGLTF/Scripts/IO/FormatterExtensionsGltf.g.cs
+++ b/Assets/VRM/UniGLTF/Scripts/IO/FormatterExtensionsGltf.g.cs
@@ -728,6 +728,11 @@ namespace UniGLTF {
     {
         f.BeginMap(0); // dummy
 
+        if(value.KHR_materials_unlit!=null)
+        {
+            f.Key("KHR_materials_unlit"); f.GenSerialize(value.KHR_materials_unlit);
+        }
+
         f.EndMap();
     }