diff --git a/lib/gzip.js b/lib/gzip.js
index 9dc8f1e..bfcdb9b 100644
--- a/lib/gzip.js
+++ b/lib/gzip.js
@@ -1,8 +1,8 @@
-(function () {
+(function (exports) {
 	'use strict';
 
-	var crc32 = require('crc32'),
-		deflate = require('deflate-js'),
+	var crc32 = exports.crc32 || require('crc32'),
+		deflate = exports.deflate || require('deflate-js'),
 		// magic numbers marking this file as GZIP
 		ID1 = 0x1F,
 		ID2 = 0x8B,
@@ -126,7 +126,7 @@
 	function zip(data, options) {
 		var flags = 0,
 			level,
-			crc, out = [];
+			out = [];
 
 		if (!options) {
 			options = {};
@@ -184,7 +184,7 @@
 		return out;
 	}
 
-	function unzip(data, options) {
+	function unzip(data/*, options*/) {
 		// start with a copy of the array
 		var arr = Array.prototype.slice.call(data, 0),
 			t,
@@ -192,7 +192,6 @@
 			flags,
 			mtime,
 			xFlags,
-			key,
 			os,
 			crc,
 			size,
@@ -270,11 +269,11 @@
 		return res;
 	}
 
-	module.exports = {
-		zip: zip,
-		unzip: unzip,
-		get DEFAULT_LEVEL() {
+	exports.zip = zip;
+	exports.unzip = unzip;
+	Object.defineProperty(exports, 'DEFAULT_LEVEL', {
+		get: function () {
 			return DEFAULT_LEVEL;
 		}
-	};
-}());
+	});
+}('undefined' !== typeof window ? window : exports));