diff --git a/drivers/staging/vt6656/rxtx.c b/drivers/staging/vt6656/rxtx.c
index efb54f5..76378d2 100644
--- a/drivers/staging/vt6656/rxtx.c
+++ b/drivers/staging/vt6656/rxtx.c
@@ -719,7 +719,7 @@
 	u16 payload_len, struct vnt_mic_hdr *mic_hdr)
 {
 	struct ieee80211_hdr *hdr = tx_context->hdr;
-	struct ieee80211_key_seq seq;
+	u64 pn64;
 	u8 *iv = ((u8 *)hdr + ieee80211_get_hdrlen_from_skb(skb));
 
 	/* strip header and icv len from payload */
@@ -752,9 +752,13 @@
 		mic_hdr->payload_len = cpu_to_be16(payload_len);
 		ether_addr_copy(mic_hdr->mic_addr2, hdr->addr2);
 
-		ieee80211_get_key_tx_seq(tx_key, &seq);
-
-		memcpy(mic_hdr->ccmp_pn, seq.ccmp.pn, IEEE80211_CCMP_PN_LEN);
+		pn64 = atomic64_read(&tx_key->tx_pn);
+		mic_hdr->ccmp_pn[5] = pn64;
+		mic_hdr->ccmp_pn[4] = pn64 >> 8;
+		mic_hdr->ccmp_pn[3] = pn64 >> 16;
+		mic_hdr->ccmp_pn[2] = pn64 >> 24;
+		mic_hdr->ccmp_pn[1] = pn64 >> 32;
+		mic_hdr->ccmp_pn[0] = pn64 >> 40;
 
 		if (ieee80211_has_a4(hdr->frame_control))
 			mic_hdr->hlen = cpu_to_be16(28);