diff --git a/tests/wpt/metadata/workers/data-url.html.ini b/tests/wpt/metadata/workers/data-url.html.ini
index 4a6faaff40c..9fb53a2d97a 100644
--- a/tests/wpt/metadata/workers/data-url.html.ini
+++ b/tests/wpt/metadata/workers/data-url.html.ini
@@ -1,4 +1,5 @@
 [data-url.html]
+  type: testharness
   expected: ERROR
   [worker has opaque origin]
     expected: FAIL