DBCC FREE PROCCACHE Syntax Error

In chapter 2 of Microsoft Press' "Inside Microsoft SQL Server 2005 - T-SQL Querying", an example showing how to use dynamic management view sys.dm_exec_query_optimizer_info begins with the following code:

SET NOCOUNT ON;
USE Northwind; -- use your database name here
DBCC FREE PROCCACHE; -- empty the procedure cache
GO

When I copy, paste and execute this query, I get the message:


Msg 102, Level 15, State 1, Line 3

Incorrect syntax near 'PROCCACHE'

How can I correct the syntax?

PS. The rest of the example seems to run properly even without the DBCC FREE PROCCACHE line.

Thanks.

Bill