diff --git a/lib/repl.js b/lib/repl.js
index 3a5ac4346e7..7cfbf0e878d 100644
--- a/lib/repl.js
+++ b/lib/repl.js
@@ -247,8 +247,8 @@ exports.REPLServer = REPLServer;
 
 // prompt is a string to print on each line for the prompt,
 // source is a stream to use for I/O, defaulting to stdin/stdout.
-exports.start = function(prompt, source, eval, useGlobal) {
-  var repl = new REPLServer(prompt, source, eval, useGlobal);
+exports.start = function(prompt, source, eval, useGlobal, ignoreUndefined) {
+  var repl = new REPLServer(prompt, source, eval, useGlobal, ignoreUndefined);
   if (!exports.repl) exports.repl = repl;
   return repl;
 };