diff --git a/layout/reftests/position-dynamic-changes/relative/reftest.list b/layout/reftests/position-dynamic-changes/relative/reftest.list
index 77605ee07a3..f1c5622a7d0 100644
--- a/layout/reftests/position-dynamic-changes/relative/reftest.list
+++ b/layout/reftests/position-dynamic-changes/relative/reftest.list
@@ -1,4 +1,4 @@
-fuzzy-if(d2d,85,20) == move-right-bottom.html move-right-bottom-ref.html # Bug 742176
+random-if(cocoaWidget) fuzzy-if(d2d,85,20) == move-right-bottom.html move-right-bottom-ref.html # Bug 742176
 random-if(cocoaWidget) fuzzy-if(d2d,85,20) == move-top-left.html move-top-left-ref.html # Bug 688545, bug 742176
-fuzzy-if(d2d,85,20) == move-right-bottom-table.html move-right-bottom-table-ref.html # Bug 742176
+random-if(cocoaWidget) fuzzy-if(d2d,85,20) == move-right-bottom-table.html move-right-bottom-table-ref.html # Bug 742176
 random-if(cocoaWidget) fuzzy-if(d2d,85,20) == move-top-left-table.html move-top-left-table-ref.html # Bug 688545, bug 742176