diff --git a/net/bluetooth/hci_sync.c b/net/bluetooth/hci_sync.c
index ffb0ceda6f7b..919ec275dd23 100644
--- a/net/bluetooth/hci_sync.c
+++ b/net/bluetooth/hci_sync.c
@@ -7241,7 +7241,8 @@ static void create_big_complete(struct hci_dev *hdev, void *data, int err)
 
 static int hci_le_big_create_sync(struct hci_dev *hdev, void *data)
 {
-	DEFINE_FLEX(struct hci_cp_le_big_create_sync, cp, bis, num_bis, 0x11);
+	DEFINE_FLEX(struct hci_cp_le_big_create_sync, cp, bis, num_bis,
+		    HCI_MAX_ISO_BIS);
 	struct hci_conn *conn = data;
 	struct bt_iso_qos *qos = &conn->iso_qos;
 	int err;