Firewall - OUTPUT rule

[JD]

  The firewall is belching these messages:

Sep 23 19:22:39 vger kernel: Dropped by firewall: IN=wlan0 OUT= MAC= 
SRC=192.168.0.8 DST=192.168.0.255 LEN=223 TOS=0x00 PREC=0x00 TTL=64 ID=0 
DF PROTO=UDP SPT=631 DPT=631 LEN=203

Thing is, 192.168.0.8 is my wlan0 ip address.

Since port 631 is the internet printing protocol, the packet must be 
getting sent by the cups daemon
because I configured to print on a network wireless printer.

What should an OUTPUT rule look like to allow these packets to be sent?
Or is it a problem with  my INPUT filters?