diff --git a/include/linux/reboot.h b/include/linux/reboot.h
index 988e55f..3005d5a 100644
--- a/include/linux/reboot.h
+++ b/include/linux/reboot.h
@@ -64,6 +64,7 @@
 extern void kernel_halt(void);
 extern void kernel_power_off(void);
 
+extern int C_A_D; /* for sysctl */
 void ctrl_alt_del(void);
 
 #define POWEROFF_CMD_PATH_LEN	256