diff --git a/layout/reftests/bugs/reftest.list b/layout/reftests/bugs/reftest.list
index adedb7e69a56..9d6f106c498e 100644
--- a/layout/reftests/bugs/reftest.list
+++ b/layout/reftests/bugs/reftest.list
@@ -125,7 +125,7 @@ random == 328829-1.xhtml 328829-1-ref.xhtml # bug 369046 (intermittent)
 == 346774-1a.html 346774-1-ref.html
 == 346774-1b.html 346774-1-ref.html
 == 346774-1c.html 346774-1-ref.html
-== 347912-1.html 347912-1-ref.html
+random-if(MOZ_WIDGET_TOOLKIT=="windows") == 347912-1.html 347912-1-ref.html
 == 348516-1.html 348516-1-ref.html
 == 348516-2.html 348516-2-ref.html
 != 348516-2.html 348516-2-notref.html