diff --git a/apple2jse.html b/apple2jse.html
index cfa0f91..143050e 100644
--- a/apple2jse.html
+++ b/apple2jse.html
@@ -97,7 +97,7 @@
           <i class="fas fa-print"></i>
         </button>
         <div style="float: right">
-          <button onclick="Apple2.window.open('about.html', 'blank')" title="About">
+          <button onclick="window.open('about.html', 'blank')" title="About">
             <i class="fas fa-info"></i>
           </button>
           <button onclick="Apple2.openOptions()">