diff --git a/libraries/Ethernet/Udp.cpp b/libraries/Ethernet/Udp.cpp
index 118174fb7..0585d6e3d 100644
--- a/libraries/Ethernet/Udp.cpp
+++ b/libraries/Ethernet/Udp.cpp
@@ -28,8 +28,8 @@
 
 #include "w5100.h"
 #include "socket.h"
-#include "ethernet.h"
-#include "udp.h"
+#include "Ethernet.h"
+#include "Udp.h"
 
 /* Start UDP socket, listening at local port PORT */
 void UdpClass::begin(uint16_t port) {