diff --git a/tools/regression/sockets/listenclose/Makefile b/tools/regression/sockets/listenclose/Makefile
index 1e146dcb30dd..8f4dc4e922d4 100644
--- a/tools/regression/sockets/listenclose/Makefile
+++ b/tools/regression/sockets/listenclose/Makefile
@@ -4,6 +4,6 @@
 
 PROG=	listenclose
 MAN=
-WARNS?=	2
+WARNS?=	6
 
 .include <bsd.prog.mk>
diff --git a/tools/regression/sockets/listenclose/listenclose.c b/tools/regression/sockets/listenclose/listenclose.c
index 425e39f15820..f920846de309 100644
--- a/tools/regression/sockets/listenclose/listenclose.c
+++ b/tools/regression/sockets/listenclose/listenclose.c
@@ -52,7 +52,7 @@
  */
 
 int
-main(int argc, char *argv[])
+main(void)
 {
 	int listen_sock, connect_sock;
 	struct sockaddr_in sin;