diff --git a/libraries/Ethernet/src/Ethernet.cpp b/libraries/Ethernet/src/Ethernet.cpp
index 8b5935eb7..0f9effb1a 100644
--- a/libraries/Ethernet/src/Ethernet.cpp
+++ b/libraries/Ethernet/src/Ethernet.cpp
@@ -62,9 +62,9 @@ void EthernetClass::begin(uint8_t *mac, IPAddress local_ip, IPAddress dns_server
 {
   W5100.init();
   W5100.setMACAddress(mac);
-  W5100.setIPAddress(local_ip._address);
-  W5100.setGatewayIp(gateway._address);
-  W5100.setSubnetMask(subnet._address);
+  W5100.setIPAddress(local_ip.raw_address());
+  W5100.setGatewayIp(gateway.raw_address());
+  W5100.setSubnetMask(subnet.raw_address());
   _dnsServerAddress = dns_server;
 }