diff --git a/_pages/coffa/assets/js/blob-stream.js b/_pages/coffa/assets/js/blob-stream.js
index 2bbfee26b..d2e1a9e7d 100644
--- a/_pages/coffa/assets/js/blob-stream.js
+++ b/_pages/coffa/assets/js/blob-stream.js
@@ -1116,7 +1116,7 @@ Buffer._augment = function (arr) {
   return arr
 }
 
-var INVALID_BASE64_RE = /[^+\/0-9A-z]/g
+var INVALID_BASE64_RE = /[^+\/0-9A-Za-z]/g
 
 function base64clean (str) {
   // Node strips out invalid characters like \n and \t from the string, base64-js does not