diff --git a/include/linux/timer.h b/include/linux/timer.h
index ffe438a901b5c0295efd86c57c6dd479a30f36fd..979fefdeb86210c15e318cc7eb8986f813181c75 100644
--- a/include/linux/timer.h
+++ b/include/linux/timer.h
@@ -124,8 +124,6 @@ static inline void timer_stats_timer_clear_start_info(struct timer_list *timer)
 }
 #endif
 
-extern void delayed_work_timer_fn(unsigned long __data);
-
 /**
  * add_timer - start a timer
  * @timer: the timer to be added
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 3f168e00ce5bf507dacc909bb7023a98cac423e9..ff06611655af71e82f915b3790b81aaa0193e61a 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -175,7 +175,7 @@ int queue_work(struct workqueue_struct *wq, struct work_struct *work)
 }
 EXPORT_SYMBOL_GPL(queue_work);
 
-void delayed_work_timer_fn(unsigned long __data)
+static void delayed_work_timer_fn(unsigned long __data)
 {
 	struct delayed_work *dwork = (struct delayed_work *)__data;
 	struct cpu_workqueue_struct *cwq = get_wq_data(&dwork->work);