diff --git a/dist/domtokenlist.js b/dist/domtokenlist.js
index d8f6e9c..66dcc30 100644
--- a/dist/domtokenlist.js
+++ b/dist/domtokenlist.js
@@ -1,5 +1,5 @@
 /*! DOMTokenlist shim | Copyright 2015 Jonathan Wilsson and Bogdan Chadkin. */
-;(function (window) {
+;typeof window !== 'undefined' && (function (window) {
     'use strict';
 
     if (!window.DOMTokenList) {
@@ -46,7 +46,7 @@
     }
 }(window));
 
-;(function (window) {
+;typeof window !== 'undefined' && (function (window) {
     'use strict';
 
     var arr = [];
@@ -176,7 +176,7 @@
     window.DOMTokenList = DOMTokenList;
 }(window));
 
-;(function () {
+;typeof window !== 'undefined' && (function () {
     'use strict';
 
     if ('classList' in document.createElement('a') && !window.QUnit) {
@@ -190,7 +190,7 @@
     });
 }());
 
-;(function () {
+;typeof window !== 'undefined' && (function () {
     'use strict';
 
     if ('relList' in document.createElement('a') && !window.QUnit) {
diff --git a/dist/domtokenlist.min.js b/dist/domtokenlist.min.js
index a684da6..24dfbb7 100644
--- a/dist/domtokenlist.min.js
+++ b/dist/domtokenlist.min.js
@@ -1,2 +1,2 @@
 /*! DOMTokenlist shim | Copyright 2015 Jonathan Wilsson and Bogdan Chadkin. */
-!function(t){"use strict";if(t.DOMTokenList){var e=document.createElement("a").classList,n=DOMTokenList.prototype,r=n.add,i=n.remove,o=n.toggle;e.add("c1","c2");var c=function(t){return function(){var e,n=arguments;for(e=0;e<n.length;e+=1)t.call(this,n[e])}};e.contains("c2")||(n.add=c(r),n.remove=c(i)),e.toggle("c1",!0)||(n.toggle=function(t,e){return void 0===e?o.call(this,t):((e?r:i).call(this,t),!!e)})}}(window),function(t){"use strict";var e=[],n=function(t,n){var r;if(e.indexOf)return e.indexOf.call(t,n);for(r=0;r<t.length;r++)if(t[r]===n)return r;return-1},r=function(t){var e=/[\u0009\u000A\u000C\u000D\u0020]/;if(""===t||e.test(t))throw new Error("Token must not be empty or contain whitespace.")},i=function(t,e){var n,r=this,i=[];if(t&&e&&(r.element=t,r.prop=e,t[e]))for(i=t[e].replace(/^\s+|\s+$/g,"").split(/\s+/),n=0;n<i.length;n++)r[n]=i[n];r.length=i.length};i.prototype={add:function(){var t,n=this,i=arguments;for(t=0;t<i.length;t++)r(i[t]),n.contains(i[t])||e.push.call(n,i[t]);n.element&&(n.element[n.prop]=n)},contains:function(t){return r(t),-1!==n(this,t)},item:function(t){return this[t]||null},remove:function(){var t,i,o=arguments,c=this;for(i=0;i<o.length;i++)r(o[i]),t=n(c,o[i]),-1!==t&&e.splice.call(c,t,1);c.element&&(c.element[c.prop]=c)},toggle:function(t,e){var n=this;return n.contains(t)?e?!0:(n.remove(t),!1):e===!1?!1:(n.add(t),!0)},toString:function(){return e.join.call(this," ")}},t.DOMTokenList=i}(window),function(){"use strict";"classList"in document.createElement("a")&&!window.QUnit||Object.defineProperty(Element.prototype,"classList",{get:function(){return new DOMTokenList(this,"className")}})}(),function(){"use strict";if(!("relList"in document.createElement("a"))||window.QUnit){var t,e=[HTMLAnchorElement,HTMLAreaElement,HTMLLinkElement],n=function(){return new DOMTokenList(this,"rel")};for(t=0;t<e.length;t++)Object.defineProperty(e[t].prototype,"relList",{get:n})}}();
\ No newline at end of file
+"undefined"!=typeof window&&function(t){"use strict";if(t.DOMTokenList){var e=document.createElement("a").classList,n=DOMTokenList.prototype,i=n.add,o=n.remove,r=n.toggle;e.add("c1","c2");var c=function(t){return function(){var e,n=arguments;for(e=0;e<n.length;e+=1)t.call(this,n[e])}};e.contains("c2")||(n.add=c(i),n.remove=c(o)),e.toggle("c1",!0)||(n.toggle=function(t,e){return void 0===e?r.call(this,t):((e?i:o).call(this,t),!!e)})}}(window),"undefined"!=typeof window&&function(t){"use strict";var e=[],n=function(t,n){var i;if(e.indexOf)return e.indexOf.call(t,n);for(i=0;i<t.length;i++)if(t[i]===n)return i;return-1},i=function(t){var e=/[\u0009\u000A\u000C\u000D\u0020]/;if(""===t||e.test(t))throw new Error("Token must not be empty or contain whitespace.")},o=function(t,e){var n,i=this,o=[];if(t&&e&&(i.element=t,i.prop=e,t[e]))for(o=t[e].replace(/^\s+|\s+$/g,"").split(/\s+/),n=0;n<o.length;n++)i[n]=o[n];i.length=o.length};o.prototype={add:function(){var t,n=this,o=arguments;for(t=0;t<o.length;t++)i(o[t]),n.contains(o[t])||e.push.call(n,o[t]);n.element&&(n.element[n.prop]=n)},contains:function(t){return i(t),-1!==n(this,t)},item:function(t){return this[t]||null},remove:function(){var t,o,r=arguments,c=this;for(o=0;o<r.length;o++)i(r[o]),t=n(c,r[o]),-1!==t&&e.splice.call(c,t,1);c.element&&(c.element[c.prop]=c)},toggle:function(t,e){var n=this;return n.contains(t)?e?!0:(n.remove(t),!1):e===!1?!1:(n.add(t),!0)},toString:function(){return e.join.call(this," ")}},t.DOMTokenList=o}(window),"undefined"!=typeof window&&function(){"use strict";"classList"in document.createElement("a")&&!window.QUnit||Object.defineProperty(Element.prototype,"classList",{get:function(){return new DOMTokenList(this,"className")}})}(),"undefined"!=typeof window&&function(){"use strict";if(!("relList"in document.createElement("a"))||window.QUnit){var t,e=[HTMLAnchorElement,HTMLAreaElement,HTMLLinkElement],n=function(){return new DOMTokenList(this,"rel")};for(t=0;t<e.length;t++)Object.defineProperty(e[t].prototype,"relList",{get:n})}}();
\ No newline at end of file
diff --git a/src/DOMTokenList-newest.js b/src/DOMTokenList-newest.js
index e852196..e9c58fe 100644
--- a/src/DOMTokenList-newest.js
+++ b/src/DOMTokenList-newest.js
@@ -1,4 +1,4 @@
-;(function (window) {
+;typeof window !== 'undefined' && (function (window) {
     'use strict';
 
     if (!window.DOMTokenList) {
diff --git a/src/DOMTokenList.js b/src/DOMTokenList.js
index 04a4144..5a8fe51 100644
--- a/src/DOMTokenList.js
+++ b/src/DOMTokenList.js
@@ -1,4 +1,4 @@
-;(function (window) {
+;typeof window !== 'undefined' && (function (window) {
     'use strict';
 
     var arr = [];
diff --git a/src/classList.js b/src/classList.js
index 97e5ea5..09c34c4 100644
--- a/src/classList.js
+++ b/src/classList.js
@@ -1,4 +1,4 @@
-;(function () {
+;typeof window !== 'undefined' && (function () {
     'use strict';
 
     if ('classList' in document.createElement('a') && !window.QUnit) {
diff --git a/src/relList.js b/src/relList.js
index 3e66779..91b1f0e 100644
--- a/src/relList.js
+++ b/src/relList.js
@@ -1,4 +1,4 @@
-;(function () {
+;typeof window !== 'undefined' && (function () {
     'use strict';
 
     if ('relList' in document.createElement('a') && !window.QUnit) {