Adding TimeStamps with EF 4.3 Migrations

I am using First First Migrations and changing the model to add timestamp fields to my tables. I am trying to add timetamp fields in a second migration. Here is an example of what my code looks like

public class User {
    public int UserId { get; set; }
    public string UserName { get; set; }      
    public byte[] TimeStamp { get; set; }
}

 public class UserModelConfiguration: EntityTypeConfiguration<User> {
        public UserModelConfiguration() {
            Property(p => p.UserName).IsRequired().HasMaxLength(250);
            Property(p => p.TimeStamp).IsRowVersion();            
        }
    }

      

        
        
        
      

    

The generated migration looks like this:

public override void Up()
        {                
            AddColumn("Users", "TimeStamp", c => c.Binary(nullable: false, fixedLength: true, timestamp: true, storeType: "rowversion"));
        }

      

        
        
        
      

    

When I run the Update-Database command, I get an error that says "By default, timestamp columns of data type cannot be created. Table Users, column TimeStamp. Failed to create constraint . I have moved all data from tables, but that didn't fix the problem.

How do I add adding a timestamp field to this migration set?