diff --git a/qa/suites/fs/bugs/multifs_mdsauthcaps/tasks/0-install.yaml b/qa/suites/fs/bugs/multifs_mdsauthcaps/tasks/0-install.yaml
index 888259772ba..4d69c600de5 100644
--- a/qa/suites/fs/bugs/multifs_mdsauthcaps/tasks/0-install.yaml
+++ b/qa/suites/fs/bugs/multifs_mdsauthcaps/tasks/0-install.yaml
@@ -1,3 +1,10 @@
+teuthology:
+  postmerge:
+    - |
+      if not (yaml.os_type == "centos" and yaml.os_version == "9.stream") then
+        -- reject kclient distro overrides
+        reject()
+      end
 meta:
 - desc: |
    install ceph/squid v19.2.2