diff --git a/src/oldloader.cpp b/src/oldloader.cpp
--- a/src/oldloader.cpp
+++ b/src/oldloader.cpp
@@ -25,6 +25,7 @@
 #include "date_func.h"
 #include "vehicle_func.h"
 #include "variables.h"
+#include "autoreplace_gui.h"
 
 enum {
 	HEADER_SIZE = 49,