--- a/src/ap/acs.c
+++ b/src/ap/acs.c
@@ -668,6 +668,10 @@ acs_find_ideal_chan_mode(struct hostapd_
 			continue;
 		}
 
+		if (iface->conf->acs_exclude_dfs &&
+                      (chan->flag & HOSTAPD_CHAN_RADAR))
+			continue;
+
 		/* HT40 on 5 GHz has a limited set of primary channels as per
 		 * 11n Annex J */
 		if (mode->mode == HOSTAPD_MODE_IEEE80211A &&