diff --git a/src/network/core/udp.h b/src/network/core/udp.h
--- a/src/network/core/udp.h
+++ b/src/network/core/udp.h
@@ -129,10 +129,10 @@ public:
 	void SendPacket(Packet *p, const struct sockaddr_in *recv);
 	void ReceivePackets();
 
-	void Send_GRFIdentifier(Packet *p, const GRFConfig *c);
+	void Send_GRFIdentifier(Packet *p, const GRFIdentifier *grf);
 	void Send_NetworkGameInfo(Packet *p, const NetworkGameInfo *info);
 
-	void Recv_GRFIdentifier(Packet *p, GRFConfig *c);
+	void Recv_GRFIdentifier(Packet *p, GRFIdentifier *grf);
 	void Recv_NetworkGameInfo(Packet *p, NetworkGameInfo *info);
 };