diff --git a/src/network/network_func.h b/src/network/network_func.h
--- a/src/network/network_func.h
+++ b/src/network/network_func.h
@@ -85,5 +85,7 @@ void CDECL NetworkAddChatMessage(TextCol
 void NetworkUndrawChatMessage();
 void NetworkChatMessageDailyLoop();
 
+void NetworkAfterNewGRFScan();
+
 #endif /* ENABLE_NETWORK */
 #endif /* NETWORK_FUNC_H */