--- src/usr.bin/nc/netcat.c
+++ src/usr.bin/nc/netcat.c
@@ -126,6 +126,9 @@ main(int argc, char *argv[])
 	uport = NULL;
 	sv = NULL;
 
+	if (argc < 1)
+		usage(1);
+
 	while ((ch = getopt(argc, argv,
 	    "46DdhI:i:jklnO:P:p:rSs:tT:UuV:vw:X:x:z")) != -1) {
 		switch (ch) {
@@ -893,10 +896,10 @@ void
 usage(int ret)
 {
 	fprintf(stderr,
-	    "usage: nc [-46DdhklnrStUuvz] [-I length] [-i interval] [-O length]\n"
-	    "\t  [-P proxy_username] [-p source_port] [-s source_ip_address] [-T ToS]\n"
-	    "\t  [-V rtable] [-w timeout] [-X proxy_protocol]\n"
-	    "\t  [-x proxy_address[:port]] [hostname] [port]\n");
+	    "usage: netcat [-46DdhklnrStUuvz] [-I length] [-i interval] [-O length]\n"
+	    "              [-P proxy_username] [-p source_port] [-s source_ip_address] [-T ToS]\n"
+	    "              [-V rtable] [-w timeout] [-X proxy_protocol]\n"
+	    "              [-x proxy_address[:port]] [hostname] [port]\n");
 	if (ret)
 		exit(1);
 }