diff --git a/css.js b/css.js
index 85d24ce..794b127 100644
--- a/css.js
+++ b/css.js
@@ -1,58 +1,63 @@
-var waitSeconds = 100;
-
-var head = document.getElementsByTagName('head')[0];
-
-// get all link tags in the page
-var links = document.getElementsByTagName('link');
-var linkHrefs = [];
-for (var i = 0; i < links.length; i++) {
-  linkHrefs.push(links[i].href);
+if (typeof window !== 'undefined') {
+  var waitSeconds = 100;
+  
+  var head = document.getElementsByTagName('head')[0];
+  
+  // get all link tags in the page
+  var links = document.getElementsByTagName('link');
+  var linkHrefs = [];
+  for (var i = 0; i < links.length; i++) {
+    linkHrefs.push(links[i].href);
+  }
+  
+  var isWebkit = !!window.navigator.userAgent.match(/AppleWebKit\/([^ ;]*)/);
+  var webkitLoadCheck = function(link, callback) {
+    setTimeout(function() {
+      for (var i = 0; i < document.styleSheets.length; i++) {
+        var sheet = document.styleSheets[i];
+        if (sheet.href == link.href)
+          return callback();
+      }
+      webkitLoadCheck(link, callback);
+    }, 10);
+  }
+  
+  var noop = function() {}
+  
+  var loadCSS = function(url) {
+    return new Promise(function(resolve, reject) {
+      var timeout = setTimeout(function() {
+        reject('Unable to load CSS');
+      }, waitSeconds * 1000);
+      var _callback = function() {
+        clearTimeout(timeout);
+        link.onload = noop;
+        setTimeout(function() {
+          resolve('');
+        }, 7);
+      }
+      var link = document.createElement('link')  ;
+      link.type = 'text/css';
+      link.rel = 'stylesheet';
+      link.href = url;
+  
+      if (!isWebkit)
+        link.onload = _callback;
+      else
+        webkitLoadCheck(link, _callback);
+  
+      head.appendChild(link);
+    });
+  }
+  
+  exports.fetch = function(load) {
+    // dont reload styles loaded in the head
+    for (var i = 0; i < linkHrefs.length; i++)
+      if (load.address == linkHrefs[i])
+        return '';
+    return loadCSS(load.address);
+  }
 }
-
-var isWebkit = !!window.navigator.userAgent.match(/AppleWebKit\/([^ ;]*)/);
-var webkitLoadCheck = function(link, callback) {
-  setTimeout(function() {
-    for (var i = 0; i < document.styleSheets.length; i++) {
-      var sheet = document.styleSheets[i];
-      if (sheet.href == link.href)
-        return callback();
-    }
-    webkitLoadCheck(link, callback);
-  }, 10);
-}
-
-var noop = function() {}
-
-var loadCSS = function(url) {
-  return new Promise(function(resolve, reject) {
-    var timeout = setTimeout(function() {
-      reject('Unable to load CSS');
-    }, waitSeconds * 1000);
-    var _callback = function() {
-      clearTimeout(timeout);
-      link.onload = noop;
-      setTimeout(function() {
-        resolve('');
-      }, 7);
-    }
-    var link = document.createElement('link')  ;
-    link.type = 'text/css';
-    link.rel = 'stylesheet';
-    link.href = url;
-
-    if (!isWebkit)
-      link.onload = _callback;
-    else
-      webkitLoadCheck(link, _callback);
-
-    head.appendChild(link);
-  });
-}
-
-exports.fetch = function(load) {
-  // dont reload styles loaded in the head
-  for (var i = 0; i < linkHrefs.length; i++)
-    if (load.address == linkHrefs[i])
-      return '';
-  return loadCSS(load.address);
+else {
+  exports.build = false;
 }