diff --git a/layout/reftests/bugs/reftest.list b/layout/reftests/bugs/reftest.list
index b6c9bb3a187..7d361ed5392 100644
--- a/layout/reftests/bugs/reftest.list
+++ b/layout/reftests/bugs/reftest.list
@@ -473,3 +473,4 @@ fails == 386310-1d.html 386310-1-ref.html
 != 404030-1-notref.html 404030-1.html
 != 404030-1-notref2.html 404030-1.html
 == 404301-1.html 404301-1-ref.html
+!= data:application/xml,<foo/> data:text/plain, # bug 404419