diff --git a/cores/esp32/IPAddress.h b/cores/esp32/IPAddress.h
index aa1d10cee29..80a4e490d7e 100644
--- a/cores/esp32/IPAddress.h
+++ b/cores/esp32/IPAddress.h
@@ -91,6 +91,6 @@ class IPAddress: public Printable
     friend class DNSClient;
 };
 
-const IPAddress INADDR_NONE(0, 0, 0, 0);
+// const IPAddress INADDR_NONE(0, 0, 0, 0);
 
 #endif
diff --git a/libraries/WiFi/src/ETH.cpp b/libraries/WiFi/src/ETH.cpp
index 092d6a3d467..ed6eabf8f5f 100644
--- a/libraries/WiFi/src/ETH.cpp
+++ b/libraries/WiFi/src/ETH.cpp
@@ -287,8 +287,12 @@ bool ETHClass::begin(uint8_t phy_addr, int power, int mdc, int mdio, eth_phy_typ
             eth_phy = esp_eth_phy_new_dm9051(&phy_config);
             break;
 #endif
+
+#if ((ESP_IDF_VERSION_MAJOR >= 4) && (ESP_IDF_VERSION_MINOR > 3))
         case ETH_PHY_KSZ8081:
             eth_phy = esp_eth_phy_new_ksz8081(&phy_config);
+            break;
+#endif
         default:
             break;
     }