diff --git a/herbe.c b/herbe.c
index 270b9e9..ff44936 100644
--- a/herbe.c
+++ b/herbe.c
@@ -86,7 +86,10 @@ void action()
 int main(int argc, char *argv[])
 {
 	if (argc == 1)
+	{
+		sem_unlink("/herbe");
 		die("Usage: %s body", argv[0]);
+	}
 
 	signal(SIGALRM, expire);
 	signal(SIGTERM, expire);