diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
index f71c37edca263a88038199514995cf92d8b79d9e..c9770ba5c7df5c3b68c909c32db7fa2fb7be39f1 100644
--- a/arch/arm/xen/enlighten.c
+++ b/arch/arm/xen/enlighten.c
@@ -172,7 +172,7 @@ static void __init xen_percpu_init(void *unused)
 	enable_percpu_irq(xen_events_irq, 0);
 }
 
-static void xen_restart(char str, const char *cmd)
+static void xen_restart(enum reboot_mode reboot_mode, const char *cmd)
 {
 	struct sched_shutdown r = { .reason = SHUTDOWN_reboot };
 	int rc;