diff --git a/extensions/OAuth.js b/extensions/OAuth.js
index c66c504370..cac38ed33a 100644
--- a/extensions/OAuth.js
+++ b/extensions/OAuth.js
@@ -6,7 +6,9 @@
 // License: MPL-2.0
 (function (Scratch) {
     'use strict';
-
+  if (!Scratch.extensions.unsandboxed) {
+    throw new Error('This extension must run unsandboxed');
+  }
     let clientId = '';
     let clientSecret = '';
     let redirectUri = '';
@@ -132,8 +134,7 @@
                         text: 'Give Feedback'
                     }
                 ],
-                menus: {},
-                unrestricted: true // Enable unsandboxed mode
+                menus: {}
             };
         }