diff --git a/drivers/isdn/mISDN/timerdev.c b/drivers/isdn/mISDN/timerdev.c
index 211ed6cffd10..578978711887 100644
--- a/drivers/isdn/mISDN/timerdev.c
+++ b/drivers/isdn/mISDN/timerdev.c
@@ -170,8 +170,8 @@ dev_expire_timer(struct timer_list *t)
 	spin_lock_irqsave(&timer->dev->lock, flags);
 	if (timer->id >= 0)
 		list_move_tail(&timer->list, &timer->dev->expired);
-	spin_unlock_irqrestore(&timer->dev->lock, flags);
 	wake_up_interruptible(&timer->dev->wait);
+	spin_unlock_irqrestore(&timer->dev->lock, flags);
 }
 
 static int