diff --git a/src/fst/fst_defs.h b/src/fst/fst_defs.h
index 8ddcc6137..5859f6f5e 100644
--- a/src/fst/fst_defs.h
+++ b/src/fst/fst_defs.h
@@ -34,7 +34,7 @@ enum session_type {
 struct session_transition_ie {
 	u8 element_id;
 	u8 length;
-	u32 fsts_id;
+	le32 fsts_id;
 	u8 session_control;
 	u8 new_band_id;
 	u8 new_band_setup;
@@ -47,7 +47,7 @@ struct session_transition_ie {
 struct fst_setup_req {
 	u8 action;
 	u8 dialog_token;
-	u32 llt;
+	le32 llt;
 	struct session_transition_ie stie;
 	/* Multi-band (optional) */
 	/* Wakeup Schedule (optional) */
@@ -70,18 +70,18 @@ struct fst_setup_res {
 struct fst_ack_req {
 	u8 action;
 	u8 dialog_token;
-	u32 fsts_id;
+	le32 fsts_id;
 } STRUCT_PACKED;
 
 struct fst_ack_res {
 	u8 action;
 	u8 dialog_token;
-	u32 fsts_id;
+	le32 fsts_id;
 } STRUCT_PACKED;
 
 struct fst_tear_down {
 	u8 action;
-	u32 fsts_id;
+	le32 fsts_id;
 } STRUCT_PACKED;
 
 #endif /* IEEE_80211_FST_DEFS_H */
diff --git a/src/fst/fst_session.c b/src/fst/fst_session.c
index 449e3044b..a80148ad0 100644
--- a/src/fst/fst_session.c
+++ b/src/fst/fst_session.c
@@ -994,7 +994,7 @@ int fst_session_respond(struct fst_session *s, u8 status_code)
 	res.stie.length = sizeof(res.stie) - 2;
 
 	if (status_code == WLAN_STATUS_SUCCESS) {
-		res.stie.fsts_id = s->data.fsts_id;
+		res.stie.fsts_id = host_to_le32(s->data.fsts_id);
 		res.stie.session_control = SESSION_CONTROL(SESSION_TYPE_BSS, 0);
 
 		fst_iface_get_channel_info(s->data.new_iface, &hw_mode,
@@ -1468,7 +1468,7 @@ int fst_test_req_send_fst_response(const char *params)
 	res.stie.length = sizeof(res.stie) - 2;
 
 	if (res.status_code == WLAN_STATUS_SUCCESS) {
-		res.stie.fsts_id = fsts_id;
+		res.stie.fsts_id = host_to_le32(fsts_id);
 		res.stie.session_control = SESSION_CONTROL(SESSION_TYPE_BSS, 0);
 
 		fst_iface_get_channel_info(s.data.new_iface, &hw_mode,
@@ -1517,7 +1517,7 @@ int fst_test_req_send_ack_request(const char *params)
 	os_memset(&req, 0, sizeof(req));
 	req.action = FST_ACTION_ACK_REQUEST;
 	req.dialog_token = g->dialog_token;
-	req.fsts_id = fsts_id;
+	req.fsts_id = host_to_le32(fsts_id);
 
 	return fst_session_send_action(&s, FALSE, &req, sizeof(req), NULL);
 }
@@ -1545,7 +1545,7 @@ int fst_test_req_send_ack_response(const char *params)
 	os_memset(&res, 0, sizeof(res));
 	res.action = FST_ACTION_ACK_RESPONSE;
 	res.dialog_token = g->dialog_token;
-	res.fsts_id = fsts_id;
+	res.fsts_id = host_to_le32(fsts_id);
 
 	return fst_session_send_action(&s, FALSE, &res, sizeof(res), NULL);
 }
@@ -1572,7 +1572,7 @@ int fst_test_req_send_tear_down(const char *params)
 
 	os_memset(&td, 0, sizeof(td));
 	td.action = FST_ACTION_TEAR_DOWN;
-	td.fsts_id = fsts_id;
+	td.fsts_id = host_to_le32(fsts_id);
 
 	return fst_session_send_action(&s, TRUE, &td, sizeof(td), NULL);
 }