diff --git a/components/esp_netif/include/esp_netif_ppp.h b/components/esp_netif/include/esp_netif_ppp.h
index b6df9fdfdb..413910c433 100644
--- a/components/esp_netif/include/esp_netif_ppp.h
+++ b/components/esp_netif/include/esp_netif_ppp.h
@@ -74,6 +74,7 @@ typedef enum {
  *
  */
 typedef enum {
+    NETIF_PPP_AUTHTYPE_NONE =      0x00,
     NETIF_PPP_AUTHTYPE_PAP =       0x01,
     NETIF_PPP_AUTHTYPE_CHAP =      0x02,
     NETIF_PPP_AUTHTYPE_MSCHAP =    0x04,