diff --git a/src/network/core/udp.cpp b/src/network/core/udp.cpp
--- a/src/network/core/udp.cpp
+++ b/src/network/core/udp.cpp
@@ -11,8 +11,6 @@
  * @file core/udp.cpp Basic functions to receive and send UDP packets.
  */
 
-#ifdef ENABLE_NETWORK
-
 #include "../../stdafx.h"
 #include "../../date_func.h"
 #include "../../debug.h"
@@ -347,5 +345,3 @@ void NetworkUDPSocketHandler::Receive_SE
 void NetworkUDPSocketHandler::Receive_CLIENT_GET_NEWGRFS(Packet *p, NetworkAddress *client_addr) { this->ReceiveInvalidPacket(PACKET_UDP_CLIENT_GET_NEWGRFS, client_addr); }
 void NetworkUDPSocketHandler::Receive_SERVER_NEWGRFS(Packet *p, NetworkAddress *client_addr) { this->ReceiveInvalidPacket(PACKET_UDP_SERVER_NEWGRFS, client_addr); }
 void NetworkUDPSocketHandler::Receive_MASTER_SESSION_KEY(Packet *p, NetworkAddress *client_addr) { this->ReceiveInvalidPacket(PACKET_UDP_MASTER_SESSION_KEY, client_addr); }
-
-#endif /* ENABLE_NETWORK */