Index: sys/dev/ath/if_ath_tx.c
===================================================================
--- sys/dev/ath/if_ath_tx.c
+++ sys/dev/ath/if_ath_tx.c
@@ -1527,7 +1527,6 @@
     struct ath_buf *bf, struct mbuf *m0, struct ath_txq *txq)
 {
 	struct ieee80211vap *vap = ni->ni_vap;
-	struct ath_hal *ah = sc->sc_ah;
 	struct ieee80211com *ic = &sc->sc_ic;
 	const struct chanAccParams *cap = &ic->ic_wme.wme_chanParams;
 	int error, iswep, ismcast, isfrag, ismrr;
@@ -1774,9 +1773,6 @@
 		    sc->sc_hwmap[rix].ieeerate, -1);
 
 	if (ieee80211_radiotap_active_vap(vap)) {
-		u_int64_t tsf = ath_hal_gettsf64(ah);
-
-		sc->sc_tx_th.wt_tsf = htole64(tsf);
 		sc->sc_tx_th.wt_flags = sc->sc_hwmap[rix].txflags;
 		if (iswep)
 			sc->sc_tx_th.wt_flags |= IEEE80211_RADIOTAP_F_WEP;
@@ -2057,7 +2053,6 @@
 	const struct ieee80211_bpf_params *params)
 {
 	struct ieee80211com *ic = &sc->sc_ic;
-	struct ath_hal *ah = sc->sc_ah;
 	struct ieee80211vap *vap = ni->ni_vap;
 	int error, ismcast, ismrr;
 	int keyix, hdrlen, pktlen, try0, txantenna;
@@ -2192,9 +2187,6 @@
 		    sc->sc_hwmap[rix].ieeerate, -1);
 
 	if (ieee80211_radiotap_active_vap(vap)) {
-		u_int64_t tsf = ath_hal_gettsf64(ah);
-
-		sc->sc_tx_th.wt_tsf = htole64(tsf);
 		sc->sc_tx_th.wt_flags = sc->sc_hwmap[rix].txflags;
 		if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED)
 			sc->sc_tx_th.wt_flags |= IEEE80211_RADIOTAP_F_WEP;
Index: sys/dev/ath/if_athioctl.h
===================================================================
--- sys/dev/ath/if_athioctl.h
+++ sys/dev/ath/if_athioctl.h
@@ -372,7 +372,6 @@
 } __packed;
 
 #define ATH_TX_RADIOTAP_PRESENT (		\
-	(1 << IEEE80211_RADIOTAP_TSFT)		| \
 	(1 << IEEE80211_RADIOTAP_FLAGS)		| \
 	(1 << IEEE80211_RADIOTAP_RATE)		| \
 	(1 << IEEE80211_RADIOTAP_DBM_TX_POWER)	| \
@@ -382,7 +381,6 @@
 
 struct ath_tx_radiotap_header {
 	struct ieee80211_radiotap_header wt_ihdr;
-	u_int64_t	wt_tsf;
 	u_int8_t	wt_flags;
 	u_int8_t	wt_rate;
 	u_int8_t	wt_txpower;
Index: sys/dev/usb/wlan/if_rum.c
===================================================================
--- sys/dev/usb/wlan/if_rum.c
+++ sys/dev/usb/wlan/if_rum.c
@@ -919,7 +919,6 @@
 
 				tap->wt_flags = 0;
 				tap->wt_rate = data->rate;
-				rum_get_tsf(sc, &tap->wt_tsf);
 				tap->wt_antenna = sc->tx_ant;
 
 				ieee80211_radiotap_tx(vap, m);
Index: sys/dev/usb/wlan/if_rumvar.h
===================================================================
--- sys/dev/usb/wlan/if_rumvar.h
+++ sys/dev/usb/wlan/if_rumvar.h
@@ -44,7 +44,6 @@
 
 struct rum_tx_radiotap_header {
 	struct ieee80211_radiotap_header wt_ihdr;
-	uint64_t	wt_tsf;
 	uint8_t		wt_flags;
 	uint8_t		wt_rate;
 	uint16_t	wt_chan_freq;
@@ -53,8 +52,7 @@
 } __packed __aligned(8);
 
 #define RT2573_TX_RADIOTAP_PRESENT					\
-	((1 << IEEE80211_RADIOTAP_TSFT) |				\
-	 (1 << IEEE80211_RADIOTAP_FLAGS) |				\
+	((1 << IEEE80211_RADIOTAP_FLAGS) |				\
 	 (1 << IEEE80211_RADIOTAP_RATE) |				\
 	 (1 << IEEE80211_RADIOTAP_CHANNEL) |				\
 	 (1 << IEEE80211_RADIOTAP_ANTENNA))
Index: sys/dev/usb/wlan/if_run.c
===================================================================
--- sys/dev/usb/wlan/if_run.c
+++ sys/dev/usb/wlan/if_run.c
@@ -3112,7 +3112,6 @@
 			    (struct rt2860_txwi *)(&data->desc + sizeof(struct rt2870_txd));
 			tap->wt_flags = 0;
 			tap->wt_rate = rt2860_rates[data->ridx].rate;
-			run_get_tsf(sc, &tap->wt_tsf);
 			tap->wt_chan_freq = htole16(ic->ic_curchan->ic_freq);
 			tap->wt_chan_flags = htole16(ic->ic_curchan->ic_flags);
 			tap->wt_hwqueue = index;
Index: sys/dev/usb/wlan/if_runvar.h
===================================================================
--- sys/dev/usb/wlan/if_runvar.h
+++ sys/dev/usb/wlan/if_runvar.h
@@ -66,7 +66,6 @@
 
 struct run_tx_radiotap_header {
 	struct ieee80211_radiotap_header wt_ihdr;
-	uint64_t	wt_tsf;
 	uint8_t		wt_flags;
 	uint8_t		wt_rate;
 	uint16_t	wt_chan_freq;
@@ -77,8 +76,7 @@
 #define IEEE80211_RADIOTAP_HWQUEUE 15
 
 #define	RUN_TX_RADIOTAP_PRESENT				\
-	(1 << IEEE80211_RADIOTAP_TSFT |			\
-	 1 << IEEE80211_RADIOTAP_FLAGS |		\
+	(1 << IEEE80211_RADIOTAP_FLAGS |		\
 	 1 << IEEE80211_RADIOTAP_RATE |			\
 	 1 << IEEE80211_RADIOTAP_CHANNEL |		\
 	 1 << IEEE80211_RADIOTAP_HWQUEUE)