diff --git a/lib/coffee-script/repl.js b/lib/coffee-script/repl.js
index d04b7cf5e8..6ff29d652b 100644
--- a/lib/coffee-script/repl.js
+++ b/lib/coffee-script/repl.js
@@ -114,7 +114,7 @@
     backlog = '';
     try {
       _ = global._;
-      returnValue = CoffeeScript["eval"]("_=(" + code + "\n)", {
+      returnValue = CoffeeScript["eval"]("_=(undefined\n" + code + "\n)", {
         filename: 'repl',
         modulename: 'repl'
       });
diff --git a/src/repl.coffee b/src/repl.coffee
index f2ca8b1846..6603a59581 100644
--- a/src/repl.coffee
+++ b/src/repl.coffee
@@ -94,7 +94,7 @@ run = (buffer) ->
   backlog = ''
   try
     _ = global._
-    returnValue = CoffeeScript.eval "_=(#{code}\n)", {
+    returnValue = CoffeeScript.eval "_=(undefined\n#{code}\n)", {
       filename: 'repl'
       modulename: 'repl'
     }