diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 3c7cfac48e3020732d2d02a2516393f1e654857c..8f654ce52570677732364164f17dc5c65ea04e3f 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -690,7 +690,6 @@ static int acm_tty_write(struct tty_struct *tty,
 		spin_unlock_irqrestore(&acm->write_lock, flags);
 		return count;
 	}
-	usb_mark_last_busy(acm->dev);
 
 	stat = acm_start_wb(acm, wb);
 	spin_unlock_irqrestore(&acm->write_lock, flags);