diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe-append-to-child-document.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe-append-to-child-document.html.ini
index ad2cf9dee6b..d73bfee8141 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe-append-to-child-document.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe-append-to-child-document.html.ini
@@ -1,3 +1,5 @@
 [iframe-append-to-child-document.html]
   type: testharness
-  disabled: https://github.com/servo/servo/issues/14411
+  [Append iframe element to its own child document]
+    bug: https://github.com/servo/servo/issues/17479
+    expected: FAIL