include FIN bit in mask of "--syn" bits
diff --git a/extensions/libipt_tcp.c b/extensions/libipt_tcp.c
index 6f9ea06..f8ed249 100644
--- a/extensions/libipt_tcp.c
+++ b/extensions/libipt_tcp.c
@@ -205,7 +205,7 @@
 			exit_error(PARAMETER_PROBLEM,
 				   "Only one of `--syn' or `--tcp-flags' "
 				   " allowed");
-		parse_tcp_flags(tcpinfo, "SYN,RST,ACK", "SYN", invert);
+		parse_tcp_flags(tcpinfo, "SYN,RST,ACK,FIN", "SYN", invert);
 		*flags |= TCP_FLAGS;
 		break;