diff --git a/drivers/net/wireless/b43/xmit.c b/drivers/net/wireless/b43/xmit.c
index 4014b6c8272b4189f22168e73690e9744d4eca6a..187c11bee0f16328b9586eaf30b335b895648e6a 100644
--- a/drivers/net/wireless/b43/xmit.c
+++ b/drivers/net/wireless/b43/xmit.c
@@ -589,12 +589,16 @@ void b43_rx(struct b43_wldev *dev, struct sk_buff *skb, const void *_rxhdr)
 	status.antenna = !!(phystat0 & B43_RX_PHYST0_ANT);
 
 	/*
-	 * If monitors are present get full 64-bit timestamp. This
-	 * code assumes we get to process the packet within 16 bits
-	 * of timestamp, i.e. about 65 milliseconds after the PHY
-	 * received the first symbol.
+	 * All frames on monitor interfaces and beacons always need a full
+	 * 64-bit timestamp. Monitor interfaces need it for diagnostic
+	 * purposes and beacons for IBSS merging.
+	 * This code assumes we get to process the packet within 16 bits
+	 * of timestamp, i.e. about 65 milliseconds after the PHY received
+	 * the first symbol.
 	 */
-	if (dev->wl->radiotap_enabled) {
+	if (((fctl & (IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE))
+	    == (IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON)) ||
+	    dev->wl->radiotap_enabled) {
 		u16 low_mactime_now;
 
 		b43_tsf_read(dev, &status.mactime);
diff --git a/drivers/net/wireless/b43legacy/xmit.c b/drivers/net/wireless/b43legacy/xmit.c
index 47e130e9fdf2ddfe7e0334e1d1a0a4953e8b79a2..dcad2491a6066ca72d8b7e448494f41ea7936dc0 100644
--- a/drivers/net/wireless/b43legacy/xmit.c
+++ b/drivers/net/wireless/b43legacy/xmit.c
@@ -546,12 +546,16 @@ void b43legacy_rx(struct b43legacy_wldev *dev,
 	status.antenna = !!(phystat0 & B43legacy_RX_PHYST0_ANT);
 
 	/*
-	 * If monitors are present get full 64-bit timestamp. This
-	 * code assumes we get to process the packet within 16 bits
-	 * of timestamp, i.e. about 65 milliseconds after the PHY
-	 * received the first symbol.
+	 * All frames on monitor interfaces and beacons always need a full
+	 * 64-bit timestamp. Monitor interfaces need it for diagnostic
+	 * purposes and beacons for IBSS merging.
+	 * This code assumes we get to process the packet within 16 bits
+	 * of timestamp, i.e. about 65 milliseconds after the PHY received
+	 * the first symbol.
 	 */
-	if (dev->wl->radiotap_enabled) {
+	if (((fctl & (IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE))
+	    == (IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON)) ||
+	    dev->wl->radiotap_enabled) {
 		u16 low_mactime_now;
 
 		b43legacy_tsf_read(dev, &status.mactime);