diff --git a/src/iop/cls/IOP/Message.cls b/src/iop/cls/IOP/Message.cls
index 56768c4..d43f638 100644
--- a/src/iop/cls/IOP/Message.cls
+++ b/src/iop/cls/IOP/Message.cls
@@ -13,7 +13,7 @@ Property classname As %String(MAXLEN = "");
 
 Property jsonObject As %DynamicObject(XMLPROJECTION = "None");
 
-Property json As %String(MAXLEN = "") [ Calculated, Transient ];
+Property json As %String(MAXLEN = "");
 
 Property jsonStream As %Stream.GlobalCharacter [ Internal, ReadOnly ];