diff --git a/src/window.cpp b/src/window.cpp
--- a/src/window.cpp
+++ b/src/window.cpp
@@ -20,6 +20,7 @@
 #include "vehicle_base.h"
 #include "settings_type.h"
 #include "cheat_func.h"
+#include "window_func.h"
 
 #include "table/sprites.h"