[exim] ACL error

Ok I added this to my exim.conf after reading the link that was posted to
me.
acl_check_rcpt:

# RBL acl
drop
log_message = match sbl.dnsbl
dnslist = sbl.dnsbl
drop
log_message = match xbl.dnsbl
dnslist = xbl.dnsbl

When i try to start exim i get the following error
2005-09-22 12:47:47 Exim configuration error in line 179 of
/etc/exim/exim.conf:
error in ACL: unknown ACL condition/modifier in "dnslist = sbl.dnsbl"

The sbl.dnsbl is the address we have given the server with spamhaus
installed on it. This is exim version 4.43.
Thanks in advance for your assistance.

Chris