diff --git a/bin/runner b/bin/runner
index 65e7c5f..0fae134 100755
--- a/bin/runner
+++ b/bin/runner
@@ -1,2 +1,2 @@
-#!/bin/sh
-eval "$1" 2>&1
+#!/usr/bin/env ruby
+exec "#{ARGV.first} 2>&1"