diff --git a/src/js/resources/cookie.js b/src/js/resources/cookie.js
index 46161a413..7928e926b 100644
--- a/src/js/resources/cookie.js
+++ b/src/js/resources/cookie.js
@@ -44,7 +44,7 @@ export function getSafeCookieValuesFn() {
         'on', 'off',
         'true', 't', 'false', 'f',
         'yes', 'y', 'no', 'n',
-        'all', 'none',
+        'all', 'none', 'functional',
     ];
 }
 registerScriptlet(getSafeCookieValuesFn, {