diff --git a/kernel/sys.c b/kernel/sys.c
index af468edf096a..70c4c5159420 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -314,6 +314,7 @@ void kernel_restart_prepare(char *cmd)
 {
 	blocking_notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd);
 	system_state = SYSTEM_RESTART;
+	usermodehelper_disable();
 	device_shutdown();
 	sysdev_shutdown();
 	syscore_shutdown();
@@ -344,6 +345,7 @@ 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);
 	system_state = state;
+	usermodehelper_disable();
 	device_shutdown();
 }
 /**