diff --git a/mozilla/layout/reftests/pixel-rounding/reftest.list b/mozilla/layout/reftests/pixel-rounding/reftest.list
index bf9d833cc94..b1cd8751eed 100644
--- a/mozilla/layout/reftests/pixel-rounding/reftest.list
+++ b/mozilla/layout/reftests/pixel-rounding/reftest.list
@@ -137,7 +137,7 @@ random == image-width-left-6.html image-width-6.html
 == offscreen-background-color-size-5.html offscreen-10-ref.html
 == offscreen-background-color-size-6.html offscreen-10-ref.html
 == offscreen-image-pos-4.html offscreen-0-ref.html
-fails == offscreen-image-pos-5.html offscreen-10-ref.html # bug 368280
+fails-if(MOZ_WIDGET_TOOLKIT!="cocoa") == offscreen-image-pos-5.html offscreen-10-ref.html # bug 368280
 == offscreen-image-pos-6.html offscreen-10-ref.html
 random == offscreen-image-size-4.html offscreen-0-ref.html # bug 371316
 random == offscreen-image-size-5.html offscreen-10-ref.html # bug 371316