diff --git a/src/FileSaver.js b/src/FileSaver.js
index 76016f1..4bdde47 100644
--- a/src/FileSaver.js
+++ b/src/FileSaver.js
@@ -140,7 +140,7 @@ var saveAs = _global.saveAs || (
     var isSafari = /constructor/i.test(_global.HTMLElement) || _global.safari
     var isChromeIOS = /CriOS\/[\d]+/.test(navigator.userAgent)
 
-    if (((isChromeIOS || (force && isSafari)) && typeof FileReader === 'object') || isWebKit && typeof FileReader === 'function') {
+    if ((isChromeIOS || isWebKit || (force && isSafari)) && typeof FileReader !== 'undefined') {
       // Safari doesn't allow downloading of blob URLs
       var reader = new FileReader()
       reader.onloadend = function () {