diff --git a/qemu/tests/cfg/virtio_serial_file_transfer.cfg b/qemu/tests/cfg/virtio_serial_file_transfer.cfg
index 6d4e40c63461b0e2d868a31a805174283a09cdf8..8a8af48308feae16a2b435e43c7be84ed7183359 100644
--- a/qemu/tests/cfg/virtio_serial_file_transfer.cfg
+++ b/qemu/tests/cfg/virtio_serial_file_transfer.cfg
@@ -43,7 +43,7 @@
                     serial_type_vs2 = virtserialport
                     serial_type_vs3 = virtserialport
                     serial_type_vs4 = virtserialport
-                    serial_reuse_bus_vs4 = no
+                    serial_bus_vs4 = "<new>"
                     serial_type_vs5 = virtserialport
                     serial_type_vs6 = virtserialport
         - max_ports: