diff --git a/common/base64.js b/common/base64.js
index 4d09b256..88365c6b 100644
--- a/common/base64.js
+++ b/common/base64.js
@@ -3,7 +3,7 @@
 const isFn = (a) => typeof a === 'function';
 
 module.exports.btoa = (str) => {
-    if (isFn(btoa))
+    if (typeof btoa === 'function')
         return btoa(str);
     
     return Buffer