Distributed Queries: Unable to map to nvarchar(max)

I am trying to map to column to nvarchar(max) instead of ntext. 

I have set the "LONG" flag and have tried setting the column size parameter to 0, ~0, -1.

In all cases the column gets mapped to a ntext.

Is there some special value for column size that denotes "unlimited" and that will force SQL Server to map to a nvarchar(max) ?

Thanks.

Bill