diff --git a/cmd/robots2policy/main.go b/cmd/robots2policy/main.go
index f42f6b0f..cc64eceb 100644
--- a/cmd/robots2policy/main.go
+++ b/cmd/robots2policy/main.go
@@ -55,7 +55,7 @@ type AnubisRule struct {
 func main() {
 	flag.Parse()
 
-	if *helpFlag || len(os.Args) == 1 {
+	if *helpFlag || flag.Narg() == 0 {
 		showHelp()
 		return
 	}