diff --git a/lib/hypervisor/hv_xen.py b/lib/hypervisor/hv_xen.py
index efc9364d199d17f421b2c7e6f8a834eb6bb615c4..eaa7ec64cf671190da8d5206b617e4ee14e243fc 100644
--- a/lib/hypervisor/hv_xen.py
+++ b/lib/hypervisor/hv_xen.py
@@ -597,7 +597,7 @@ class XenHvmHypervisor(XenHypervisor):
     if hvp[constants.HV_VNC_BIND_ADDRESS] is None:
       config.write("vnclisten = '%s'\n" % constants.VNC_DEFAULT_BIND_ADDRESS)
     else:
-      config.write("vnclisten = '%s'\n" % hvp["vnc_bind_address"])
+      config.write("vnclisten = '%s'\n" % hvp[constants.HV_VNC_BIND_ADDRESS])
 
     if instance.network_port > constants.VNC_BASE_PORT:
       display = instance.network_port - constants.VNC_BASE_PORT