diff --git a/target/linux/ixp4xx-2.6/config b/target/linux/ixp4xx-2.6/config
index dcb6dd7fe..e28bf9114 100644
--- a/target/linux/ixp4xx-2.6/config
+++ b/target/linux/ixp4xx-2.6/config
@@ -339,6 +339,7 @@ CONFIG_NETFILTER_XT_MATCH_LENGTH=m
 CONFIG_NETFILTER_XT_MATCH_LIMIT=m
 CONFIG_NETFILTER_XT_MATCH_MAC=m
 CONFIG_NETFILTER_XT_MATCH_MARK=m
+CONFIG_NETFILTER_XT_MATCH_PORTSCAN=m
 CONFIG_NETFILTER_XT_MATCH_POLICY=m
 CONFIG_NETFILTER_XT_MATCH_MULTIPORT=m
 CONFIG_NETFILTER_XT_MATCH_PHYSDEV=m