diff --git a/testing/web-platform/meta/js/builtins/WeakMap.prototype-properties.html.ini b/testing/web-platform/meta/js/builtins/WeakMap.prototype-properties.html.ini
index 04efb3bcdcf66..849c761e19a0a 100644
--- a/testing/web-platform/meta/js/builtins/WeakMap.prototype-properties.html.ini
+++ b/testing/web-platform/meta/js/builtins/WeakMap.prototype-properties.html.ini
@@ -1,5 +1,5 @@
 [WeakMap.prototype-properties.html]
   type: testharness
-  [WeakMap.prototype.get.length]
+  [WeakMap.prototype.@@toStringTag]
     expected: FAIL