diff --git a/server/src/com/cloud/vm/UserVmManagerImpl.java b/server/src/com/cloud/vm/UserVmManagerImpl.java
index 93e99eb9273..0499a904387 100755
--- a/server/src/com/cloud/vm/UserVmManagerImpl.java
+++ b/server/src/com/cloud/vm/UserVmManagerImpl.java
@@ -2621,6 +2621,7 @@ public class UserVmManagerImpl extends ManagerBase implements UserVmManager, Vir
                     throw new InvalidParameterValueException("VM Creation failed. Volume size: " + diskSize + "GB is out of allowed range. Max: " + customDiskOfferingMaxSize
                             + " Min:" + customDiskOfferingMinSize);
                 }
+                size=size+diskSize*(1024*1024*1024);
             }
             size += _diskOfferingDao.findById(diskOfferingId).getDiskSize();
         }