diff --git a/xen/common/keyhandler.c b/xen/common/keyhandler.c
index 0bb842ec00..b0a2051408 100644
--- a/xen/common/keyhandler.c
+++ b/xen/common/keyhandler.c
@@ -251,7 +251,7 @@ static void cf_check dump_hwdom_registers(unsigned char key)
     }
 }
 
-static void cf_check reboot_machine(unsigned char key, bool unused)
+static void noreturn cf_check reboot_machine(unsigned char key, bool unused)
 {
     printk("'%c' pressed -> rebooting machine\n", key);
     machine_restart(0);