diff --git a/3rd/lua/bee_utf8_crt.cpp b/3rd/lua/bee_utf8_crt.cpp
index dad230a8..65f6e1ea 100644
--- a/3rd/lua/bee_utf8_crt.cpp
+++ b/3rd/lua/bee_utf8_crt.cpp
@@ -7,7 +7,7 @@
 
 #    include <Windows.h>
 #    include <bee/platform/win/cwtf8.h>
-#    include <bee/platform/win/wtf8.h>
+#    include <bee/utility/zstring_view.h>
 #    include <io.h>
 
 #    include <array>
@@ -15,8 +15,6 @@
 #    include <cassert>
 #    include <string>
 
-#    define U2W(s) bee::wtf8::u2w(s).c_str()
-
 namespace {
     struct spinlock {
         struct guard {
@@ -44,8 +42,36 @@ namespace {
         }
         std::atomic<bool> l = { false };
     };
+    std::wstring u2w(bee::zstring_view str) noexcept {
+        if (str.empty()) {
+            return L"";
+        }
+        size_t wlen = wtf8_to_utf16_length(str.data(), str.size());
+        if (wlen == (size_t)-1) {
+            return L"";
+        }
+        std::wstring wresult(wlen, L'\0');
+        wtf8_to_utf16(str.data(), str.size(), wresult.data(), wlen);
+        return wresult;
+    }
+
+    template <size_t N>
+    struct ringbuff {
+        std::array<void*, N> data {};
+        size_t n = 0;
+        void push(void* v) {
+            n = (n + 1) % N;
+            free(data[n]);
+            data[n] = v;
+        }
+    };
 }
 
+static spinlock getenv_lock;
+static ringbuff<64> getenv_rets;
+
+#    define U2W(s) u2w(s).c_str()
+
 FILE* __cdecl utf8_fopen(const char* filename, const char* mode) {
     return _wfopen(U2W(filename), U2W(mode));
 }
@@ -70,21 +96,6 @@ int __cdecl utf8_rename(const char* oldfilename, const char* newfilename) {
     return _wrename(U2W(oldfilename), U2W(newfilename));
 }
 
-namespace {
-    template <size_t N>
-    struct ringbuff {
-        std::array<void*, N> data {};
-        size_t n = 0;
-        void push(void* v) {
-            n = (n + 1) % N;
-            free(data[n]);
-            data[n] = v;
-        }
-    };
-}
-static spinlock getenv_lock;
-static ringbuff<64> getenv_rets;
-
 char* __cdecl utf8_getenv(const char* varname) {
     wchar_t* wstr;
     size_t wlen;
@@ -173,7 +184,7 @@ unsigned long __stdcall utf8_FormatMessageA(
 static void ConsoleWrite(FILE* stream, bee::zstring_view str) {
     HANDLE handle = (HANDLE)_get_osfhandle(_fileno(stream));
     if (FILE_TYPE_CHAR == GetFileType(handle)) {
-        auto r = bee::wtf8::u2w(str);
+        auto r = u2w(str);
         if (!r.empty()) {
             if (WriteConsoleW(handle, r.data(), (DWORD)r.size(), NULL, NULL)) {
                 return;
diff --git a/bootstrap/main.cpp b/bootstrap/main.cpp
index 81f10100..4dd38400 100644
--- a/bootstrap/main.cpp
+++ b/bootstrap/main.cpp
@@ -246,6 +246,9 @@ static int pmain(lua_State *L) {
 }
 
 #if defined(_WIN32)
+extern "C" {
+#    include "3rd/lua/bee_utf8_main.c"
+}
 extern "C" int utf8_main(int argc, char **argv) {
 #else
 int main(int argc, char **argv) {
diff --git a/compile/bootstrap.lua b/compile/bootstrap.lua
index 8a7c0b0d..adf8006b 100644
--- a/compile/bootstrap.lua
+++ b/compile/bootstrap.lua
@@ -5,7 +5,11 @@ require "config"
 lm:import "common.lua"
 
 lm:source_set "source_bootstrap" {
-    deps = { "source_bee", "source_lua" },
+    deps = {
+        "source_bee",
+        "source_lua",
+        "bee_utf8_crt",
+    },
     includes = { "3rd/lua", "." },
     sources = "bootstrap/main.cpp",
     macos = {
diff --git a/compile/common.lua b/compile/common.lua
index a083d3c3..4a177b7f 100644
--- a/compile/common.lua
+++ b/compile/common.lua
@@ -177,12 +177,9 @@ lm:lua_source "source_bee" {
     },
 }
 
-lm:source_set "source_lua" {
+lm:source_set "bee_utf8_crt" {
     includes = ".",
-    sources = {
-        "3rd/lua/bee_utf8_crt.cpp",
-        "3rd/lua/bee_utf8_main.c",
-    },
+    sources = "3rd/lua/bee_utf8_crt.cpp",
 }
 
 lm:source_set "source_lua" {
diff --git a/compile/lua.lua b/compile/lua.lua
index 3778cb24..d9c3fa41 100644
--- a/compile/lua.lua
+++ b/compile/lua.lua
@@ -12,13 +12,6 @@ lm:lua_dll "bee" {
 }
 
 if lm.os == "windows" then
-    lm:source_set "bee_utf8_crt" {
-        includes = ".",
-        sources = {
-            "3rd/lua/bee_utf8_crt.cpp",
-            "bee/platform/win/wtf8_win.cpp",
-        },
-    }
     lm:shared_library "lua54" {
         deps = "bee_utf8_crt",
         sources = {