diff --git a/src/coreml.cs b/src/coreml.cs
index 9a64038e2b96..3ec6e3b3482d 100644
--- a/src/coreml.cs
+++ b/src/coreml.cs
@@ -47,6 +47,7 @@ public enum MLModelError : long {
 		IO = 3,
 		[Watch (4,2), TV (11,2), Mac (10,13,2, onlyOn64: true), iOS (11,2)]
 		CustomLayer = 4,
+		CustomModel = 5,
 	}
 
 	[Watch (4,0), TV (11,0), Mac (10,13, onlyOn64: true), iOS (11,0)]