diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index dc8177950d0..4591853f6eb 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -392,8 +392,10 @@ static void xen_irq_init(unsigned irq)
 	struct irq_info *info;
 	struct irq_desc *desc = irq_to_desc(irq);
 
+#ifdef CONFIG_SMP
 	/* By default all event channels notify CPU#0. */
 	cpumask_copy(desc->irq_data.affinity, cpumask_of(0));
+#endif
 
 	info = kzalloc(sizeof(*info), GFP_KERNEL);
 	if (info == NULL)