diff --git a/src/ap/hw_features.c b/src/ap/hw_features.c
index 93d19e0ba..7849be181 100644
--- a/src/ap/hw_features.c
+++ b/src/ap/hw_features.c
@@ -349,6 +349,22 @@ static void ieee80211n_check_scan(struct hostapd_iface *iface)
 		}
 	}
 
+#ifdef CONFIG_IEEE80211AX
+	if (iface->conf->secondary_channel &&
+	    iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G &&
+	    iface->conf->ieee80211ax) {
+		struct he_capabilities *he_cap;
+
+		he_cap = &iface->current_mode->he_capab[IEEE80211_MODE_AP];
+		if (!(he_cap->phy_cap[HE_PHYCAP_CHANNEL_WIDTH_SET_IDX] &
+		      HE_PHYCAP_CHANNEL_WIDTH_SET_40MHZ_IN_2G)) {
+			wpa_printf(MSG_DEBUG,
+				   "HE: 40 MHz channel width is not supported in 2.4 GHz; clear secondary channel configuration");
+			iface->conf->secondary_channel = 0;
+		}
+	}
+#endif /* CONFIG_IEEE80211AX */
+
 	if (iface->conf->secondary_channel)
 		res = ieee80211n_allowed_ht40_channel_pair(iface);
 	if (!res) {