diff --git a/tools/python/xen/xend/XendConfig.py b/tools/python/xen/xend/XendConfig.py
index eaa9eee01e..09a0cb3013 100644
--- a/tools/python/xen/xend/XendConfig.py
+++ b/tools/python/xen/xend/XendConfig.py
@@ -991,6 +991,7 @@ class XendConfig(dict):
                                     dev_type, dev_cfg = self['devices'][dev_uuid]
                                     is_bootable = dev_cfg.get('bootable', 0)
                                     config.append(['bootable', int(is_bootable)])
+                                    config.append(['VDI'], dev_cfg.get('VDI', ''))
 
                                 sxpr.append(['device', config])