diff --git a/README.md b/README.md
index 6842f5b..d1aaa7c 100644
--- a/README.md
+++ b/README.md
@@ -2,8 +2,8 @@
   <img src="https://github.com/jcubic/sysend.js/blob/master/assets/logo.svg?raw=true" alt="Sysend.js logo"/>
 </p>
 
-[![npm](https://img.shields.io/badge/npm-1.17.3-blue.svg)](https://www.npmjs.com/package/sysend)
-![bower](https://img.shields.io/badge/bower-1.17.3-yellow.svg)
+[![npm](https://img.shields.io/badge/npm-1.17.4-blue.svg)](https://www.npmjs.com/package/sysend)
+![bower](https://img.shields.io/badge/bower-1.17.4-yellow.svg)
 ![downloads](https://img.shields.io/npm/dt/sysend.svg)
 [![jsdelivr](https://img.shields.io/jsdelivr/npm/hm/sysend)](https://www.jsdelivr.com/package/npm/sysend)
 
@@ -56,7 +56,7 @@ You can also use the HTTP header:
 Origin-Trial: <TOKEN>
 ```
 
-Right now the API only works with localStorage fallback (when inside iframes).
+Right now, the API only works with localStorage fallback (when inside iframes).
 
 ## Installation
 
diff --git a/sysend.js b/sysend.js
index 589ea7c..c0b0c6d 100644
--- a/sysend.js
+++ b/sysend.js
@@ -1,5 +1,5 @@
 /**@license
- *  sysend.js - send messages between browser windows/tabs version 1.17.3
+ *  sysend.js - send messages between browser windows/tabs version 1.17.4
  *
  *  Copyright (C) 2014 Jakub T. Jankiewicz <https://jcubic.pl/me>
  *  Released under the MIT license
@@ -865,7 +865,8 @@
     // -------------------------------------------------------------------------
     function init() {
         if (is_function(window.BroadcastChannel)) {
-            if (is_secured_iframe() && document.requestStorageAccess) {
+            const ssa = document.requestStorageAccess && 'hasUnpartitionedCookieAccess' in document;
+            if (is_secured_iframe() && ssa) {
                 document.requestStorageAccess({
                     all: true
                 }).then(function(handle) {