diff --git a/layout/reftests/bugs/reftest.list b/layout/reftests/bugs/reftest.list
index f72b4ea1391d..5944074362d0 100644
--- a/layout/reftests/bugs/reftest.list
+++ b/layout/reftests/bugs/reftest.list
@@ -1958,7 +1958,7 @@ fuzzy(0-8,0-1900) fails-if(webrender) == 1291528.html 1291528-ref.html
 # should be same.  |fuzzy()| here allows the difference in border, but not
 # background color.
 fuzzy(0-255,0-1000) skip-if(!cocoaWidget) == 1294102-1.html 1294102-1-ref.html
-fuzzy-if(skiaContent,0-15,0-50) fuzzy-if(gtkWidget,0-14,0-215) fuzzy-if(!nativeThemePref,0-14,0-172) == 1295466-1.xhtml 1295466-1-ref.xhtml #bug 1540635
+fuzzy-if(skiaContent,0-15,0-50) fuzzy-if(gtkWidget,0-14,0-215) fuzzy-if(/^Windows\x20NT\x206\.1/.test(http.oscpu),0-14,0-172) == 1295466-1.xhtml 1295466-1-ref.xhtml #bug 1540635
 fuzzy-if(Android,0-27,0-874) fuzzy-if(!Android,0-14,0-43) == 1313772.xhtml 1313772-ref.xhtml # Bug 1128229, Bug 1389319
 fuzzy(0-3,0-320000) == 1315113-1.html 1315113-1-ref.html
 fuzzy(0-3,0-20000) == 1315113-2.html 1315113-2-ref.html