diff --git a/src/postal.js b/src/postal.js
index 8de1af6..e438580 100644
--- a/src/postal.js
+++ b/src/postal.js
@@ -2,10 +2,7 @@
 (function ( root, factory ) {
 	if ( typeof module === "object" && module.exports ) {
 		// Node, or CommonJS-Like environments
-		module.exports = function ( _ ) {
-			_ = _ || require( "underscore" );
-			return factory( _, this );
-		};
+		module.exports = factory( require( "underscore" ), this );
 	} else if ( typeof define === "function" && define.amd ) {
 		// AMD. Register as an anonymous module.
 		define( ["underscore"], function ( _ ) {