diff --git a/vendor/luajit/src/lib_os.c b/vendor/luajit/src/lib_os.c
index 8c96b86c7..05b324950 100644
--- a/vendor/luajit/src/lib_os.c
+++ b/vendor/luajit/src/lib_os.c
@@ -32,6 +32,23 @@
 
 /* ------------------------------------------------------------------------ */
 
+#if LJ_TARGET_WINDOWS
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+
+static wchar_t *widen_static(const char *narrow, int idx)
+{
+  __declspec(thread) static wchar_t buffer[2][MAX_PATH];
+  return MultiByteToWideChar(CP_UTF8, 0, narrow, -1, buffer[idx], MAX_PATH) ? buffer[idx] : L"";
+}
+
+#define remove(x) _wremove(widen_static(x, 0))
+#define system(x) _wsystem(widen_static(x, 0))
+#define rename(x, y) _wrename(widen_static(x, 0), widen_static(y, 1))
+#endif
+
+/* ------------------------------------------------------------------------ */
+
 #define LJLIB_MODULE_os
 
 LJLIB_CF(os_execute)