diff --git a/src/train_cmd.cpp b/src/train_cmd.cpp
--- a/src/train_cmd.cpp
+++ b/src/train_cmd.cpp
@@ -22,7 +22,7 @@
 #include "newgrf_text.h"
 #include "group.h"
 #include "strings_func.h"
-#include "functions.h"
+#include "viewport_func.h"
 #include "window_func.h"
 #include "vehicle_func.h"
 #include "sound_func.h"