diff --git a/tools/python/xen/xend/image.py b/tools/python/xen/xend/image.py
index 5d1afcb9ae..d6aa9182de 100644
--- a/tools/python/xen/xend/image.py
+++ b/tools/python/xen/xend/image.py
@@ -419,6 +419,7 @@ class HVMImageHandler(ImageHandler):
 
             if not vnc_config.get('vncunused', 0) and \
                    vnc_config.get('vncdisplay', 0):
+                vncdisplay = vnc_config.get('vncdisplay')
                 ret.append('-vnc')
                 ret.append(str(vncdisplay))
             else: