diff --git a/std/cstdio.hpp b/std/cstdio.hpp
index 61bbf45..6b568e5 100644
--- a/std/cstdio.hpp
+++ b/std/cstdio.hpp
@@ -1,3 +1,6 @@
 #pragma once
 
 #include <cstdio>
+
+#define fseek64 fseeko
+#define ftell64 ftello