diff --git a/environments/low-memory-usage.yaml b/environments/low-memory-usage.yaml
index 4431e31473..07b27b1579 100644
--- a/environments/low-memory-usage.yaml
+++ b/environments/low-memory-usage.yaml
@@ -21,3 +21,5 @@ parameter_defaults:
   # Override defaults to get HEALTH_OK with 1 OSD (for testing only)
   CephPoolDefaultSize: 1
   CephPoolDefaultPgNum: 32
+
+  NovaReservedHostMemory: 512