diff --git a/packages/isomorphic-unfetch/browser.js b/packages/isomorphic-unfetch/browser.js
index 13b55c2..ed13eef 100644
--- a/packages/isomorphic-unfetch/browser.js
+++ b/packages/isomorphic-unfetch/browser.js
@@ -1 +1 @@
-module.exports = window.fetch || (window.fetch = require('unfetch').default || require('unfetch'));
+module.exports = self.fetch || (self.fetch = require('unfetch').default || require('unfetch'));