diff --git a/sys/dev/ral/rt2560.c b/sys/dev/ral/rt2560.c
index b72ca403f149..58f459054f83 100644
--- a/sys/dev/ral/rt2560.c
+++ b/sys/dev/ral/rt2560.c
@@ -1612,6 +1612,7 @@ rt2560_tx_mgt(struct rt2560_softc *sc, struct mbuf *m0,
 	struct rt2560_tx_desc *desc;
 	struct rt2560_tx_data *data;
 	struct ieee80211_frame *wh;
+	struct ieee80211_key *k;
 	bus_dma_segment_t segs[RT2560_MAX_SCATTER];
 	uint16_t dur;
 	uint32_t flags = 0;
@@ -1622,6 +1623,16 @@ rt2560_tx_mgt(struct rt2560_softc *sc, struct mbuf *m0,
 
 	rate = IEEE80211_IS_CHAN_5GHZ(ic->ic_curchan) ? 12 : 2;
 
+	wh = mtod(m0, struct ieee80211_frame *);
+
+	if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
+		k = ieee80211_crypto_encap(ic, ni, m0);
+		if (k == NULL) {
+			m_freem(m0);
+			return ENOBUFS;
+		}
+	}
+
 	error = bus_dmamap_load_mbuf_sg(sc->prioq.data_dmat, data->map, m0,
 	    segs, &nsegs, 0);
 	if (error != 0) {
diff --git a/sys/dev/ral/rt2661.c b/sys/dev/ral/rt2661.c
index 60171ee6e74b..8d6e859a14f0 100644
--- a/sys/dev/ral/rt2661.c
+++ b/sys/dev/ral/rt2661.c
@@ -1430,6 +1430,7 @@ rt2661_tx_mgt(struct rt2661_softc *sc, struct mbuf *m0,
 	struct rt2661_tx_desc *desc;
 	struct rt2661_tx_data *data;
 	struct ieee80211_frame *wh;
+	struct ieee80211_key *k;
 	bus_dma_segment_t segs[RT2661_MAX_SCATTER];
 	uint16_t dur;
 	uint32_t flags = 0;	/* XXX HWSEQ */
@@ -1441,6 +1442,16 @@ rt2661_tx_mgt(struct rt2661_softc *sc, struct mbuf *m0,
 	/* send mgt frames at the lowest available rate */
 	rate = IEEE80211_IS_CHAN_5GHZ(ic->ic_curchan) ? 12 : 2;
 
+	wh = mtod(m0, struct ieee80211_frame *);
+
+	if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
+		k = ieee80211_crypto_encap(ic, ni, m0);
+		if (k == NULL) {
+			m_freem(m0);
+			return ENOBUFS;
+		}
+	}
+
 	error = bus_dmamap_load_mbuf_sg(sc->mgtq.data_dmat, data->map, m0,
 	    segs, &nsegs, 0);
 	if (error != 0) {
diff --git a/sys/dev/usb/if_rum.c b/sys/dev/usb/if_rum.c
index aa060f4f7d2f..55433158ee85 100644
--- a/sys/dev/usb/if_rum.c
+++ b/sys/dev/usb/if_rum.c
@@ -1132,6 +1132,7 @@ rum_tx_mgt(struct rum_softc *sc, struct mbuf *m0, struct ieee80211_node *ni)
 	struct rum_tx_desc *desc;
 	struct rum_tx_data *data;
 	struct ieee80211_frame *wh;
+	struct ieee80211_key *k;
 	uint32_t flags = 0;
 	uint16_t dur;
 	usbd_status error;
@@ -1147,6 +1148,16 @@ rum_tx_mgt(struct rum_softc *sc, struct mbuf *m0, struct ieee80211_node *ni)
 
 	wh = mtod(m0, struct ieee80211_frame *);
 
+	if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
+		k = ieee80211_crypto_encap(ic, ni, m0);
+		if (k == NULL) {
+			m_freem(m0);
+			return ENOBUFS;
+		}
+	}
+
+	wh = mtod(m0, struct ieee80211_frame *);
+
 	if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 		flags |= RT2573_TX_NEED_ACK;
 
diff --git a/sys/dev/usb/if_ural.c b/sys/dev/usb/if_ural.c
index 819a730dec89..c2b063ff683d 100644
--- a/sys/dev/usb/if_ural.c
+++ b/sys/dev/usb/if_ural.c
@@ -1192,6 +1192,7 @@ ural_tx_mgt(struct ural_softc *sc, struct mbuf *m0, struct ieee80211_node *ni)
 	struct ural_tx_desc *desc;
 	struct ural_tx_data *data;
 	struct ieee80211_frame *wh;
+	struct ieee80211_key *k;
 	uint32_t flags = 0;
 	uint16_t dur;
 	usbd_status error;
@@ -1202,6 +1203,16 @@ ural_tx_mgt(struct ural_softc *sc, struct mbuf *m0, struct ieee80211_node *ni)
 
 	rate = IEEE80211_IS_CHAN_5GHZ(ic->ic_curchan) ? 12 : 2;
 
+	wh = mtod(m0, struct ieee80211_frame *);
+
+	if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
+		k = ieee80211_crypto_encap(ic, ni, m0);
+		if (k == NULL) {
+			m_freem(m0);
+			return ENOBUFS;
+		}
+	}
+
 	data->m = m0;
 	data->ni = ni;
 
diff --git a/sys/dev/usb/if_zyd.c b/sys/dev/usb/if_zyd.c
index 1cece8b8e753..45be4d1029d3 100644
--- a/sys/dev/usb/if_zyd.c
+++ b/sys/dev/usb/if_zyd.c
@@ -2014,6 +2014,7 @@ zyd_tx_mgt(struct zyd_softc *sc, struct mbuf *m0, struct ieee80211_node *ni)
 	struct zyd_tx_desc *desc;
 	struct zyd_tx_data *data;
 	struct ieee80211_frame *wh;
+	struct ieee80211_key *k;
 	int xferlen, totlen, rate;
 	uint16_t pktlen;
 	usbd_status error;
@@ -2023,6 +2024,16 @@ zyd_tx_mgt(struct zyd_softc *sc, struct mbuf *m0, struct ieee80211_node *ni)
 
 	rate = IEEE80211_IS_CHAN_5GHZ(ic->ic_curchan) ? 12 : 2;
 
+	wh = mtod(m0, struct ieee80211_frame *);
+
+	if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
+		k = ieee80211_crypto_encap(ic, ni, m0);
+		if (k == NULL) {
+			m_freem(m0);
+			return ENOBUFS;
+		}
+	}
+
 	data->ni = ni;
 	data->m = m0;