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-rw-r--r--lib/readline.js2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/readline.js b/lib/readline.js
index bafef00e0d..8c6b1a89b2 100644
--- a/lib/readline.js
+++ b/lib/readline.js
@@ -25,6 +25,8 @@
// * http://invisible-island.net/xterm/ctlseqs/ctlseqs.html
// * http://www.3waylabs.com/nw/WWW/products/wizcon/vt220.html
+'use strict';
+
var kHistorySize = 30;
var util = require('util');