diff --git a/Assets/UniGLTF/Runtime/UniGLTF/IO/MaterialIO/Import/IMaterialDescriptorGenerator.cs b/Assets/UniGLTF/Runtime/UniGLTF/IO/MaterialIO/Import/IMaterialDescriptorGenerator.cs
index 522cc3e56..6ba99e4d2 100644
--- a/Assets/UniGLTF/Runtime/UniGLTF/IO/MaterialIO/Import/IMaterialDescriptorGenerator.cs
+++ b/Assets/UniGLTF/Runtime/UniGLTF/IO/MaterialIO/Import/IMaterialDescriptorGenerator.cs
@@ -14,6 +14,6 @@
         /// <summary>
         /// Generate the MaterialDescriptor for the non-specified glTF material.
         /// </summary>
-        MaterialDescriptor GetGltfDefault();
+        MaterialDescriptor GetGltfDefault(string materialName = null);
     }
 }