Pseudoterminals increase: compilation error

[Unga]

Hi all

I'm using FreeBSD 7.0.

As per FAQ, http://www.freebsd.org/doc/en_US.ISO8859-1/books/faq/admin.html, I tried to increase the number of ptys:
 "10.19.1
 Build and install a new kernel with the line in the
 configuration file:
 device pty N
 where N is the number of requested pseudoterminals."

I tried to recompile the kernel.  I have modified the GENERIC as follows:
device          pty  64          # Pseudo-ttys (telnet etc)

This results a compilation error:
config: /usr/src/sys/i386/conf/GENERIC:268: syntax error
*** Error code 1

What is the correct syntax?

Kind Regards
Unga