diff --git a/rw_core/coreIf/device_manager_if.go b/rw_core/coreIf/device_manager_if.go
index 367f442..d2e6356 100644
--- a/rw_core/coreIf/device_manager_if.go
+++ b/rw_core/coreIf/device_manager_if.go
@@ -34,4 +34,5 @@
 	DeleteLogicalPorts(cDevice *voltha.Device) error
 	DeleteAllChildDevices(cDevice *voltha.Device) error
 	RunPostDeviceDelete(cDevice *voltha.Device) error
+	MarkChildDevicesAsUnReachable(cDevice *voltha.Device) error
 }