diff --git a/server/src/main/java/com/cloud/vm/UserVmManagerImpl.java b/server/src/main/java/com/cloud/vm/UserVmManagerImpl.java
index 9e3622886e94..384a3a03a0f0 100644
--- a/server/src/main/java/com/cloud/vm/UserVmManagerImpl.java
+++ b/server/src/main/java/com/cloud/vm/UserVmManagerImpl.java
@@ -3840,6 +3840,9 @@ private UserVm createVirtualMachine(DataCenter zone, ServiceOffering serviceOffe
                 rootDiskOfferingId = diskOfferingId;
                 diskOfferingId = null;
             }
+            if (!customParameters.containsKey(VmDetailConstants.ROOT_DISK_SIZE)) {
+                customParameters.put(VmDetailConstants.ROOT_DISK_SIZE, String.valueOf(diskSize));
+            }
         }
         if (!offering.getDiskOfferingStrictness() && overrideDiskOfferingId != null) {
             rootDiskOfferingId = overrideDiskOfferingId;