diff --git a/src/SA3D.Modeling/File/ModelFile.cs b/src/SA3D.Modeling/File/ModelFile.cs
index 89481f9..c589f50 100644
--- a/src/SA3D.Modeling/File/ModelFile.cs
+++ b/src/SA3D.Modeling/File/ModelFile.cs
@@ -430,6 +430,8 @@ private static void WriteNJ(EndianStackWriter writer, Node model, ModelFormat fo
 				case ModelFormat.SA2:
 					writer.WriteUShort(CM);
 					break;
+				case ModelFormat.SA2B:
+				case ModelFormat.Buffer:
 				default:
 					throw new ArgumentException($"Attach format {format} not supported for NJ binaries");
 			}