diff --git a/puppet/services/nova-compute.yaml b/puppet/services/nova-compute.yaml
index 16ccb9e07a..e39e997a5a 100644
--- a/puppet/services/nova-compute.yaml
+++ b/puppet/services/nova-compute.yaml
@@ -72,7 +72,7 @@ parameters:
     description: >
       Reserved RAM for host processes.
     type: number
-    default: 2048
+    default: 4096
     constraints:
       - range: { min: 512 }
   MonitoringSubscriptionNovaCompute:
diff --git a/releasenotes/notes/increase-nova-reserved-host-memory-80434e8484a29680.yaml b/releasenotes/notes/increase-nova-reserved-host-memory-80434e8484a29680.yaml
new file mode 100644
index 0000000000..88f67a0301
--- /dev/null
+++ b/releasenotes/notes/increase-nova-reserved-host-memory-80434e8484a29680.yaml
@@ -0,0 +1,4 @@
+---
+other:
+  - Increased the default of NovaReservedHostMemory for
+    Compute nodes to 4096 MB.