I'm having trouble making a filter that does the following...

I need a filter that is a SYSTEM WIDE filter that sets the bounce email to a specific email address. Again, I want every message sent through my MTA (Exim4) to have one email address for all bounces.

I tried:
# Exim filter
deliver $recipients errors_to the_one@email.address
in /etc/exim4/filters/bounces.filter

And I tried enabling it like:
(in /etc/exim4/update-exim4.conf.conf)
system_filter = /etc/exim4/filters/bounces.filter
... but no luck. I get back "/etc/exim4/update-exim4.conf.conf: 32: system_filter: not found" when I try to restart exim.

How can I do this? Thanks for the help!