diff --git a/drivers/staging/rtl8192u/r8192U_core.c b/drivers/staging/rtl8192u/r8192U_core.c
index 71f5cde9ed1c1ae775f993917662f81bdb1b1c19..a18430e2abbd576b45ef8b38cb44838701caf85e 100644
--- a/drivers/staging/rtl8192u/r8192U_core.c
+++ b/drivers/staging/rtl8192u/r8192U_core.c
@@ -1271,8 +1271,8 @@ struct sk_buff *DrvAggr_Aggregation(struct net_device *dev, struct ieee80211_drv
 		/* Subframe drv Tx descriptor and firmware info setting */
 		skb = pSendList->tx_agg_frames[i];
 		tcb_desc = (cb_desc *)(skb->cb + MAX_DEV_ADDR_SIZE);
-		tx_agg_desc = (tx_desc_819x_usb_aggr_subframe *)agg_skb->tail;
-		tx_fwinfo = (tx_fwinfo_819x_usb *)(agg_skb->tail + sizeof(tx_desc_819x_usb_aggr_subframe));
+		tx_agg_desc = (tx_desc_819x_usb_aggr_subframe *)skb_tail_pointer(agg_skb);
+		tx_fwinfo = (tx_fwinfo_819x_usb *)(skb_tail_pointer(agg_skb) + sizeof(tx_desc_819x_usb_aggr_subframe));
 
 		memset(tx_fwinfo,0,sizeof(tx_fwinfo_819x_usb));
 		/* DWORD 0 */