diff --git a/src/network/network_client.h b/src/network/network_client.h
--- a/src/network/network_client.h
+++ b/src/network/network_client.h
@@ -57,6 +57,7 @@ protected:
 	NetworkRecvStatus Receive_SERVER_SYNC(Packet *p) override;
 	NetworkRecvStatus Receive_SERVER_COMMAND(Packet *p) override;
 	NetworkRecvStatus Receive_SERVER_CHAT(Packet *p) override;
+	NetworkRecvStatus Receive_SERVER_EXTERNAL_CHAT(Packet *p) override;
 	NetworkRecvStatus Receive_SERVER_QUIT(Packet *p) override;
 	NetworkRecvStatus Receive_SERVER_ERROR_QUIT(Packet *p) override;
 	NetworkRecvStatus Receive_SERVER_SHUTDOWN(Packet *p) override;