diff --git a/network_server.h b/network_server.h
--- a/network_server.h
+++ b/network_server.h
@@ -15,6 +15,7 @@ void NetworkServer_HandleChat(NetworkAct
 bool NetworkServer_ReadPackets(NetworkClientState *cs);
 void NetworkServer_Tick(void);
 void NetworkServerMonthlyLoop(void);
+void NetworkServerYearlyLoop(void);
 
 #endif /* ENABLE_NETWORK */