diff --git a/sys/dev/rtwn/rtl8192c/r92c_tx.c b/sys/dev/rtwn/rtl8192c/r92c_tx.c
--- a/sys/dev/rtwn/rtl8192c/r92c_tx.c
+++ b/sys/dev/rtwn/rtl8192c/r92c_tx.c
@@ -452,13 +452,10 @@
 	} else {
 		uint16_t seqno;
 
-		/* TODO: seqno allocate through net80211? */
-		/* TODO: what to do about QoS NULL frames? */
-		if (m->m_flags & M_AMPDU_MPDU) {
-			seqno = ni->ni_txseqs[tid] % IEEE80211_SEQ_RANGE;
-			ni->ni_txseqs[tid]++;
-		} else
-			seqno = M_SEQNO_GET(m) % IEEE80211_SEQ_RANGE;
+		if (m->m_flags & M_AMPDU_MPDU)
+			ieee80211_output_seqno_assign(ni, -1, m);
+
+		seqno = M_SEQNO_GET(m);
 
 		/* Set sequence number. */
 		txd->txdseq = htole16(seqno);
@@ -513,7 +510,7 @@
 		rtwn_r92c_tx_setup_hwseq(sc, txd);
 	} else {
 		/* Set sequence number. */
-		txd->txdseq |= htole16(M_SEQNO_GET(m) % IEEE80211_SEQ_RANGE);
+		txd->txdseq |= htole16(M_SEQNO_GET(m));
 	}
 }
 
diff --git a/sys/dev/rtwn/rtl8812a/r12a_tx.c b/sys/dev/rtwn/rtl8812a/r12a_tx.c
--- a/sys/dev/rtwn/rtl8812a/r12a_tx.c
+++ b/sys/dev/rtwn/rtl8812a/r12a_tx.c
@@ -433,14 +433,9 @@
 	} else {
 		uint16_t seqno;
 
-		/* TODO: seqno allocate through net80211? */
-		/* TODO: what to do about QoS NULL frames? */
-		if (m->m_flags & M_AMPDU_MPDU) {
-			seqno = ni->ni_txseqs[tid];
-			ni->ni_txseqs[tid]++;
-		} else
-			seqno = M_SEQNO_GET(m) % IEEE80211_SEQ_RANGE;
-
+		if (m->m_flags & M_AMPDU_MPDU)
+			ieee80211_output_seqno_assign(ni, -1, m);
+		seqno = M_SEQNO_GET(m);
 		/* Set sequence number. */
 		txd->txdw9 |= htole32(SM(R12A_TXDW9_SEQ, seqno));
 	}
@@ -495,8 +490,7 @@
 		txd->txdw3 |= htole32(SM(R12A_TXDW3_SEQ_SEL, uvp->id));
 	} else {
 		/* Set sequence number. */
-		txd->txdw9 |= htole32(SM(R12A_TXDW9_SEQ,
-		    M_SEQNO_GET(m) % IEEE80211_SEQ_RANGE));
+		txd->txdw9 |= htole32(SM(R12A_TXDW9_SEQ, M_SEQNO_GET(m)));
 	}
 }