How to escape '%' inside varchar @params for RAISERROR funcion in SQL Server 2012

How I should escape the % character in params so my RAISERROR retun my message declare @msg varchar(max) = (SELECT ' Message with % ' AS MSG) if @msg is not null begin RAISERROR (@msg ,16,1); end This will rise error with message > Msg 2787, Level 16, State 1, Line 4 > Invalid format specification: '% '. For end users this message is unreadable. My messages is generated from database and setting this message. Way I do avoid getting wrong message is replacing set @msg = REPLACE(@msg,'%','P') But I still do not know how to add % sign