diff --git a/run b/run
new file mode 100755
index 0000000..3d958d3
--- /dev/null
+++ b/run
@@ -0,0 +1,2 @@
+#!/bin/rc
+6.out -s50000000
diff --git a/scemu.c b/scemu.c
index d7e27e1..94787d4 100644
--- a/scemu.c
+++ b/scemu.c
@@ -66,6 +66,9 @@ main(int argc, char **argv)
 	case 's':
 		target = atoll(EARGF(usage()));
 		break;
+	default:
+		usage();
+		break;
 	}ARGEND
 	openprog(*argv, &progsiz);
 	if(prog == nil)