diff --git a/lib/nova_plugins/hypervisor-xenserver b/lib/nova_plugins/hypervisor-xenserver
index 3eb9149..e7f1e87 100644
--- a/lib/nova_plugins/hypervisor-xenserver
+++ b/lib/nova_plugins/hypervisor-xenserver
@@ -29,7 +29,8 @@
 # Allow ``build_domU.sh`` to specify the flat network bridge via kernel args
 FLAT_NETWORK_BRIDGE_DEFAULT=$(sed -e 's/.* flat_network_bridge=\([[:alnum:]]*\).*$/\1/g' /proc/cmdline)
 if is_service_enabled neutron; then
-    XEN_INTEGRATION_BRIDGE=$(sed -e 's/.* xen_integration_bridge=\([[:alnum:]]*\).*$/\1/g' /proc/cmdline)
+    XEN_INTEGRATION_BRIDGE_DEFAULT=$(sed -e 's/.* xen_integration_bridge=\([[:alnum:]]*\).*$/\1/g' /proc/cmdline)
+    XEN_INTEGRATION_BRIDGE=${XEN_INTEGRATION_BRIDGE:-$XEN_INTEGRATION_BRIDGE_DEFAULT}
 fi
 
 VNCSERVER_PROXYCLIENT_ADDRESS=${VNCSERVER_PROXYCLIENT_ADDRESS=169.254.0.1}