diff --git a/src/autoreplace_gui.cpp b/src/autoreplace_gui.cpp
--- a/src/autoreplace_gui.cpp
+++ b/src/autoreplace_gui.cpp
@@ -17,6 +17,7 @@
 #include "strings_func.h"
 #include "window_func.h"
 #include "vehicle_func.h"
+#include "autoreplace_func.h"
 
 static RailType _railtype_selected_in_replace_gui;