diff --git a/layout/reftests/bugs/reftest.list b/layout/reftests/bugs/reftest.list
index a3eba75dc643..3b899b81b494 100644
--- a/layout/reftests/bugs/reftest.list
+++ b/layout/reftests/bugs/reftest.list
@@ -369,4 +369,4 @@ random-if(MOZ_WIDGET_TOOLKIT=="cocoa") == 379316-2.html 379316-2-ref.html # bug
 == 391909-1.html 391909-1-ref.html
 == 391994-1.html 391994-1-ref.html
 == 393649-1.html 393649-1-ref.html
-== 393517-1.html about:blank  # crash test
+== 393517-1.xhtml about:blank  # crash test