1 files changed, 2 insertions, 0 deletions
diff --git a/lib/repl.js b/lib/repl.js
index 578f99ed22..50d6cc2647 100644
--- a/lib/repl.js
+++ b/lib/repl.js
@@ -40,6 +40,8 @@
  *   repl.start("node > ").context.foo = "stdin is fun";
  */
 
+'use strict';
+
 var util = require('util');
 var inherits = require('util').inherits;
 var Stream = require('stream');