Table-Valued function - Order by is ignored in output

We are moving from SQL Server 2008 to SQL Server 2012 and immediately noticed that all our table-valued functions no longer deliver their temp table contents in the correctly sorted order.

CODE:

INSERT INTO @Customer
        SELECT Customer_ID, Name,
        CASE 
            WHEN Expiry_Date < GETDATE() then 1 
            WHEN Expired = 1 then 1 
            ELSE 0
            END
        from Customer **order by Name**

In SQL Server 2008 this function returns the customers sorted by Name. In SQL Server 2012 it returns the table unsorted. The "order by" is ignored in SQL 2012.

Do we have to re-write all the functions to include a sort_id and then sort them when they are called in the main application or is there an easy fix??