diff --git a/qa/workunits/mon/crush_ops.sh b/qa/workunits/mon/crush_ops.sh
index c2744fa279d..f1770e171eb 100755
--- a/qa/workunits/mon/crush_ops.sh
+++ b/qa/workunits/mon/crush_ops.sh
@@ -70,7 +70,7 @@ ceph osd crush rm foo
 
 # test reweight
 o3=`ceph osd create`
-ceph osd crush add $o3 123 root=foo
+ceph osd crush add $o3 123 root=default
 ceph osd tree | grep osd.$o3 | grep 123
 ceph osd crush reweight osd.$o3 113
 ceph osd tree | grep osd.$o3 | grep 113