diff --git a/qa/workunits/ceph-helpers.sh b/qa/workunits/ceph-helpers.sh
index f5a2ee405c8..4dcef3399c2 100755
--- a/qa/workunits/ceph-helpers.sh
+++ b/qa/workunits/ceph-helpers.sh
@@ -491,6 +491,7 @@ function activate_osd() {
     ceph_args+=" --osd-data=$osd_data"
     ceph_args+=" --chdir="
     ceph_args+=" --osd-pool-default-erasure-code-directory=.libs"
+    ceph_args+=" --osd-class-dir=.libs"
     ceph_args+=" --run-dir=$dir"
     ceph_args+=" --debug-osd=20"
     ceph_args+=" --log-file=$dir/\$name.log"