diff --git a/layout/reftests/bugs/reftest.list b/layout/reftests/bugs/reftest.list
index e3eb6d85cf9..84631e89297 100644
--- a/layout/reftests/bugs/reftest.list
+++ b/layout/reftests/bugs/reftest.list
@@ -822,6 +822,7 @@ random == 403134-1.html 403134-1-ref.html # bug 405377
 != 409659-1b.html 409659-1-ref.html
 != 409659-1c.html 409659-1-ref.html
 == 409659-1d.html 409659-1-ref.html
+== 410621-1.html 410621-1-ref.html
 == 411059-1.html 411059-1-ref.html
 == 411334-1.xml 411334-1-ref.xml
 == 411585-1.html 411585-1-ref.html