diff --git a/net-firewall/iptables/iptables-9999.ebuild b/net-firewall/iptables/iptables-9999.ebuild
index cc7b683..d4424e8 100644
--- a/net-firewall/iptables/iptables-9999.ebuild
+++ b/net-firewall/iptables/iptables-9999.ebuild
@@ -56,6 +56,7 @@ src_configure() {
 		--enable-devel \
 		--enable-shared \
 		$(use_enable pcap bpf-compiler) \
+		$(use_enable pcap nfsynproxy) \
 		$(use_enable static-libs static) \
 		$(use_enable ipv6)
 }