diff --git a/server/src/main/java/com/cloud/vm/UserVmManagerImpl.java b/server/src/main/java/com/cloud/vm/UserVmManagerImpl.java
index fcf7008ad28..cc31eac1d2a 100644
--- a/server/src/main/java/com/cloud/vm/UserVmManagerImpl.java
+++ b/server/src/main/java/com/cloud/vm/UserVmManagerImpl.java
@@ -1261,6 +1261,19 @@ public class UserVmManagerImpl extends ManagerBase implements UserVmManager, Vir
         return resizeVolumeCmd;
     }
 
+    private void resizeRootVolumeOfVmWithNewOffering(VMInstanceVO vmInstance, ServiceOfferingVO newServiceOffering)
+            throws ResourceAllocationException {
+        DiskOfferingVO newROOTDiskOffering = _diskOfferingDao.findById(newServiceOffering.getId());
+        List<VolumeVO> vols = _volsDao.findReadyRootVolumesByInstance(vmInstance.getId());
+
+        for (final VolumeVO rootVolumeOfVm : vols) {
+            rootVolumeOfVm.setDiskOfferingId(newROOTDiskOffering.getId());
+            ResizeVolumeCmd resizeVolumeCmd = new ResizeVolumeCmd(rootVolumeOfVm.getId(), newROOTDiskOffering.getMinIops(), newROOTDiskOffering.getMaxIops());
+            _volumeService.resizeVolume(resizeVolumeCmd);
+            _volsDao.update(rootVolumeOfVm.getId(), rootVolumeOfVm);
+        }
+    }
+
     @Override
     @ActionEvent(eventType = EventTypes.EVENT_NIC_CREATE, eventDescription = "Creating Nic", async = true)
     public UserVm addNicToVirtualMachine(AddNicToVMCmd cmd) throws InvalidParameterValueException, PermissionDeniedException, CloudRuntimeException {