diff --git a/src/network/network_gui.h b/src/network/network_gui.h
--- a/src/network/network_gui.h
+++ b/src/network/network_gui.h
@@ -12,6 +12,8 @@
 #ifndef NETWORK_GUI_H
 #define NETWORK_GUI_H
 
+#include "../company_type.h"
+#include "../economy_type.h"
 #include "../window_type.h"
 #include "network_type.h"