Problem using "string" support on iptables

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I want block a certain packets with some text on it.
Im using iptables 1.3.5 and i want do the follow:

iptables -I FORWARD -p tcp --dport 1863 -m string --string "someuser" -j DROP

And i get this error:

iptables v1.3.5: STRING match: You must specify `--algo'

Why i get that problem?

Thanks.


--
Ing. Rogelio C. Sevilla Fernández
Dirección de Desarrollo Telemático / Secretaria de Administración
Tel (312)3162062 / (312)3162000 ext 2360
Gobierno del Estado de Colima.

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 "2006, AÑO DEL BICENTENARIO DEL NATALICIO DEL LIC.
    BENITO JUAREZ BENEMERITO DE LAS AMERICAS"
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