diff --git a/src/train_cmd.cpp b/src/train_cmd.cpp
--- a/src/train_cmd.cpp
+++ b/src/train_cmd.cpp
@@ -47,6 +47,7 @@
 #include "autoreplace_gui.h"
 #include "gfx_func.h"
 #include "settings_type.h"
+#include "order_func.h"
 
 #include "table/strings.h"
 #include "table/train_cmd.h"