diff --git a/ruby/a1 b/ruby/a1
index 101dc04..a990fd5 100755
--- a/ruby/a1
+++ b/ruby/a1
@@ -1,4 +1,4 @@
-#!/usr/bin/env ruby -w
+#!/usr/bin/env -S ruby -w
 
 require "English"
 require_relative "shell"