diff --git a/main.c b/main.c
index 04f394e..a3c180a 100644
--- a/main.c
+++ b/main.c
@@ -42,7 +42,8 @@ int main(int argc, char* argv[])
 	{
 		if(argc != 4)
 		{
-			print_help(argv[0]);
+			printf("usage: %s set [CHANNEL] [VALUE]\n", argv[0]);
+			uvosled_poweroff(&led);
 			return 0;
 		}