diff --git a/src/drivers/driver.h b/src/drivers/driver.h
index 9018c083c..3dc4827a5 100644
--- a/src/drivers/driver.h
+++ b/src/drivers/driver.h
@@ -4340,6 +4340,15 @@ enum wpa_event_type {
 	 * range.
 	 */
 	EVENT_BEACON_LOSS,
+
+	/**
+	 * EVENT_DFS_PRE_CAC_EXPIRED - Notify that channel availability check
+	 * done previously (Pre-CAC) on the channel has expired. This would
+	 * normally be on a non-ETSI DFS regulatory domain. DFS state of the
+	 * channel will be moved from available to usable. A new CAC has to be
+	 * performed before start operating on this channel.
+	 */
+	EVENT_DFS_PRE_CAC_EXPIRED,
 };
 
 
diff --git a/src/drivers/driver_common.c b/src/drivers/driver_common.c
index b6bcbcad2..220b7d415 100644
--- a/src/drivers/driver_common.c
+++ b/src/drivers/driver_common.c
@@ -82,6 +82,7 @@ const char * event_to_string(enum wpa_event_type event)
 	E2S(DFS_CAC_STARTED);
 	E2S(P2P_LO_STOP);
 	E2S(BEACON_LOSS);
+	E2S(DFS_PRE_CAC_EXPIRED);
 	}
 
 	return "UNKNOWN";
diff --git a/src/drivers/driver_nl80211_event.c b/src/drivers/driver_nl80211_event.c
index ed2cbe490..f05c5466c 100644
--- a/src/drivers/driver_nl80211_event.c
+++ b/src/drivers/driver_nl80211_event.c
@@ -1568,6 +1568,10 @@ static void nl80211_radar_event(struct wpa_driver_nl80211_data *drv,
 	case NL80211_RADAR_NOP_FINISHED:
 		wpa_supplicant_event(drv->ctx, EVENT_DFS_NOP_FINISHED, &data);
 		break;
+	case NL80211_RADAR_PRE_CAC_EXPIRED:
+		wpa_supplicant_event(drv->ctx, EVENT_DFS_PRE_CAC_EXPIRED,
+				     &data);
+		break;
 	default:
 		wpa_printf(MSG_DEBUG, "nl80211: Unknown radar event %d "
 			   "received", event_type);