diff --git a/src/saveload/saveload.h b/src/saveload/saveload.h
--- a/src/saveload/saveload.h
+++ b/src/saveload/saveload.h
@@ -324,6 +324,8 @@ void SlArray(void *array, size_t length,
 void SlObject(void *object, const SaveLoad *sld);
 bool SlObjectMember(void *object, const SaveLoad *sld);
 
+bool SaveloadCrashWithMissingNewGRFs();
+
 extern char _savegame_format[8];
 
 #endif /* SAVELOAD_H */