diff --git a/mozilla/layout/reftests/bugs/reftest.list b/mozilla/layout/reftests/bugs/reftest.list
index 459a5db4d6b..9a940c5a1ba 100644
--- a/mozilla/layout/reftests/bugs/reftest.list
+++ b/mozilla/layout/reftests/bugs/reftest.list
@@ -505,7 +505,7 @@ random == 403134-1.html 403134-1-ref.html # bug 405377
 == 404666-2.html 404666-2-ref.html
 == 405186-1.xhtml about:blank
 == 405305-1.html 405305-1-ref.html
-== 405577-1.html 405577-1-ref.html
+#== 405577-1.html 405577-1-ref.html  # disabled because of failure: bug 405577
 == 405584-1.html 405584-1-ref.html
 == 406484-1.html 406484-1-ref.html
 == 406568-1.html 406568-1-ref.html