diff --git a/tests/pillar/compute_cluster.sls b/tests/pillar/compute_cluster.sls
index bd61ecc..c3a2485 100644
--- a/tests/pillar/compute_cluster.sls
+++ b/tests/pillar/compute_cluster.sls
@@ -64,3 +64,5 @@
         port: 11211
       - host: 127.0.2.1
         port: 11211
+    libvirt:
+      hw_disk_discard: unmap