diff --git a/include/linux/reboot.h b/include/linux/reboot.h
index 85ea63f462af39fe0b589ac236baae4ee2831b39..b93b541cf111d08701c40939b9f201429a213e56 100644
--- a/include/linux/reboot.h
+++ b/include/linux/reboot.h
@@ -59,8 +59,6 @@ extern void machine_crash_shutdown(struct pt_regs *);
  * Architecture independent implemenations of sys_reboot commands.
  */
 
-extern void kernel_shutdown_prepare(enum system_states state);
-
 extern void kernel_restart(char *cmd);
 extern void kernel_halt(void);
 extern void kernel_power_off(void);
diff --git a/kernel/sys.c b/kernel/sys.c
index 4162d12390b64a8e94cf20e251118524714a59e9..53de35fc82458eeade26a07e9a36f1acfc18b88a 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -315,7 +315,7 @@ static void kernel_kexec(void)
 #endif
 }
 
-void kernel_shutdown_prepare(enum system_states state)
+static void kernel_shutdown_prepare(enum system_states state)
 {
 	blocking_notifier_call_chain(&reboot_notifier_list,
 		(state == SYSTEM_HALT)?SYS_HALT:SYS_POWER_OFF, NULL);