diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 907792b7211454a77c465bb725533352b555bb03..c6042c7e23f2432dd053dc45270c5fb295bf1fda 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -741,6 +741,7 @@ static QEMUMachine xenfv_machine = {
     .init = pc_xen_hvm_init,
     .max_cpus = HVM_MAX_VCPUS,
     .default_machine_opts = "accel=xen",
+    .hot_add_cpu = pc_hot_add_cpu,
 };
 #endif