diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..eb6047c
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+
+node_modules
+npm-debug.log
diff --git a/underscore.nest.js b/underscore.nest.js
index adccbdb..d356f87 100644
--- a/underscore.nest.js
+++ b/underscore.nest.js
@@ -4,7 +4,16 @@
 * Copyright (c) 2012 Irene Ros;
 * Underscore.Nest is freely distributable under the MIT license.
 */
-(function(global, _) {
+(function(global) {
+
+  var _ = global._;
+
+  if(_ === undefined) {
+    if (typeof require !== 'undefined') {
+      _ = require('underscore');
+    }
+  }
+
 
   var nester = global.nest = {};
 
@@ -100,4 +109,5 @@
     global._.mixin(nester);
   }
 
-}(this, _));
\ No newline at end of file
+}(this));
+