diff --git a/rw_core/mocks/adapter_olt.go b/rw_core/mocks/adapter_olt.go
index f23df4d..e13e774 100644
--- a/rw_core/mocks/adapter_olt.go
+++ b/rw_core/mocks/adapter_olt.go
@@ -263,7 +263,7 @@
 }
 
 // Child_device_lost deletes ONU and its references
-func (oltA *OLTAdapter) Child_device_lost(ctx context.Context, deviceID string, pPortNo uint32, onuID uint32) error { // nolint
+func (oltA *OLTAdapter) Child_device_lost(ctx context.Context, childDevice *voltha.Device) error { // nolint
 	return nil
 }