diff --git a/src/timetable_cmd.cpp b/src/timetable_cmd.cpp
--- a/src/timetable_cmd.cpp
+++ b/src/timetable_cmd.cpp
@@ -4,13 +4,14 @@
 
 #include "stdafx.h"
 #include "openttd.h"
-#include "functions.h"
 #include "variables.h"
 #include "table/strings.h"
 #include "command_func.h"
 #include "date.h"
 #include "player.h"
 #include "vehicle.h"
+#include "functions.h"
+#include "window_func.h"
 
 
 static void ChangeTimetable(Vehicle *v, VehicleOrderID order_number, uint16 time, bool is_journey)