diff --git a/hostapd/ctrl_iface.c b/hostapd/ctrl_iface.c
index 6265265..9ce7829 100644
--- a/hostapd/ctrl_iface.c
+++ b/hostapd/ctrl_iface.c
@@ -1252,16 +1252,28 @@
 #endif /* CONFIG_TESTING_OPTIONS */
 
 
-static int hostapd_ctrl_iface_chan_switch(struct hostapd_data *hapd, char *pos)
+static int hostapd_ctrl_iface_chan_switch(struct hostapd_iface *iface,
+					  char *pos)
 {
 #ifdef NEED_AP_MLME
 	struct csa_settings settings;
-	int ret = hostapd_parse_csa_settings(pos, &settings);
+	int ret;
+	unsigned int i;
 
+	ret = hostapd_parse_csa_settings(pos, &settings);
 	if (ret)
 		return ret;
 
-	return hostapd_switch_channel(hapd, &settings);
+	for (i = 0; i < iface->num_bss; i++) {
+		ret = hostapd_switch_channel(iface->bss[i], &settings);
+		if (ret) {
+			/* FIX: What do we do if CSA fails in the middle of
+			 * submitting multi-BSS CSA requests? */
+			return ret;
+		}
+	}
+
+	return 0;
 #else /* NEED_AP_MLME */
 	return -1;
 #endif /* NEED_AP_MLME */
@@ -1541,7 +1553,7 @@
 			reply_len = -1;
 #endif /* CONFIG_TESTING_OPTIONS */
 	} else if (os_strncmp(buf, "CHAN_SWITCH ", 12) == 0) {
-		if (hostapd_ctrl_iface_chan_switch(hapd, buf + 12))
+		if (hostapd_ctrl_iface_chan_switch(hapd->iface, buf + 12))
 			reply_len = -1;
 	} else if (os_strncmp(buf, "VENDOR ", 7) == 0) {
 		reply_len = hostapd_ctrl_iface_vendor(hapd, buf + 7, reply,