Perhaps the trick in this thread (4th post) of allocating the object with “new” instead of using the constructor, and then setting each attribute of the object might work. Or you could just call the constructor directly in your method. Note 1) that the linked example uses structref instead of jitclass, I don’t recall if there is a different special new() for jitclass, you can check the jitclass source 2) if you don’t set every attribute when you do this approach then it is possible to have uninitialized values in the object that have undefined behavior.