diff --git a/src/economy.cpp b/src/economy.cpp
--- a/src/economy.cpp
+++ b/src/economy.cpp
@@ -45,6 +45,7 @@
 #include "signal_func.h"
 #include "gfx_func.h"
 #include "autoreplace_func.h"
+#include "player_gui.h"
 
 #include "table/strings.h"
 #include "table/sprites.h"