diff --git a/lib/browser.js b/lib/browser.js
index 09e7c70e..0f2c8e42 100644
--- a/lib/browser.js
+++ b/lib/browser.js
@@ -1,2 +1,2 @@
 /* eslint-env browser */
-module.exports = typeof self == 'object' ? self.FormData : window.FormData;
+module.exports = typeof self == 'object' ? self.FormData : typeof window !='undefined' ? window.FormData : undefined;