diff --git a/src/saveload/oldloader.cpp b/src/saveload/oldloader.cpp
--- a/src/saveload/oldloader.cpp
+++ b/src/saveload/oldloader.cpp
@@ -23,6 +23,8 @@
 
 #include <exception>
 
+#include "../safeguards.h"
+
 static const int TTO_HEADER_SIZE = 41;
 static const int TTD_HEADER_SIZE = 49;