diff --git a/3rd/lua-seri/lua-seri.c b/3rd/lua-seri/lua-seri.cpp
similarity index 97%
rename from 3rd/lua-seri/lua-seri.c
rename to 3rd/lua-seri/lua-seri.cpp
index 7aee9bdb..84caad3f 100644
--- a/3rd/lua-seri/lua-seri.c
+++ b/3rd/lua-seri/lua-seri.cpp
@@ -8,8 +8,12 @@
 
 #endif
 
-#include <lua.h>
-#include <lauxlib.h>
+#ifdef __cplusplus
+#    include <lua.hpp>
+#else
+#    include <lauxlib.h>
+#    include <lua.h>
+#endif
 #include <stdlib.h>
 #include <stdint.h>
 #include <assert.h>
@@ -92,14 +96,14 @@ struct read_block {
 
 inline static struct block *
 blk_alloc(void) {
-	struct block *b = malloc(sizeof(struct block));
+	struct block *b = (struct block *)malloc(sizeof(struct block));
 	b->next = NULL;
 	return b;
 }
 
 static inline void
 wb_push(struct write_block *b, const void *buf, int sz) {
-	const char * buffer = buf;
+	const char * buffer = (const char *)buf;
 	if (b->ptr == BLOCK_SIZE) {
 _again:
 		b->current = b->current->next = blk_alloc();
@@ -355,7 +359,7 @@ mark_table(lua_State *L, struct write_block *b, int index) {
 	}
 	if (id < MAX_REFERENCE) {
 		b->r[id].object = obj;
-		b->r[id].address = addr;
+		b->r[id].address = (uint8_t*)addr;
 	} else {
 		++id;
 		lua_pushinteger(L, id);
@@ -383,12 +387,12 @@ wb_table(lua_State *L, struct write_block *wb, int index) {
 static int
 ref_ancestor(lua_State *L, struct write_block *b, int index) {
 	struct stack *s = &b->s;
-	int n = s->depth;
-	if (n == 0 || n >= MAX_DEPTH)
+	int depth = s->depth;
+	if (depth == 0 || depth >= MAX_DEPTH)
 		return 0;
 	int i;
 	const void * obj = lua_topointer(L, index);
-	for (i=n-1;i>=0;i--) {
+	for (i=depth-1;i>=0;i--) {
 		const void * ancestor = lua_topointer(L, s->ancestor[i]);
 		if (ancestor == obj) {
 			uint8_t n = COMBINE_TYPE(TYPE_REF, i);
@@ -610,7 +614,7 @@ static void unpack_one(lua_State *L, struct read_block *rb);
 static int
 get_extend_integer(lua_State *L, struct read_block *rb) {
 	uint8_t type;
-	const uint8_t *t = rb_read(rb, sizeof(type));
+	const uint8_t *t = (const uint8_t *)rb_read(rb, sizeof(type));
 	if (t==NULL) {
 		invalid_stream(L,rb);
 	}
@@ -752,7 +756,7 @@ push_value(lua_State *L, struct read_block *rb, int type, int cookie) {
 static void
 unpack_one(lua_State *L, struct read_block *rb) {
 	uint8_t type;
-	const uint8_t *t = rb_read(rb, sizeof(type));
+	const uint8_t *t = (const uint8_t *)rb_read(rb, sizeof(type));
 	if (t==NULL) {
 		invalid_stream(L, rb);
 	}
@@ -762,7 +766,7 @@ unpack_one(lua_State *L, struct read_block *rb) {
 
 static void *
 seri(struct block *b, int len) {
-	uint8_t * buffer = malloc(len + 4);
+	uint8_t * buffer = (uint8_t *)malloc(len + 4);
 	memcpy(buffer, &len, 4);	// write length
 	uint8_t * ptr = buffer + 4;
 	while(len>0) {
@@ -797,7 +801,7 @@ seri_unpack(lua_State *L, void *buffer) {
 			luaL_checkstack(L,LUA_MINSTACK,NULL);
 		}
 		uint8_t type = 0;
-		const uint8_t *t = rb_read(&rb, sizeof(type));
+		const uint8_t *t = (const uint8_t *)rb_read(&rb, sizeof(type));
 		if (t==NULL)
 			break;
 		type = *t;
diff --git a/3rd/lua-seri/lua-seri.h b/3rd/lua-seri/lua-seri.h
index 56f3d84f..0e764540 100644
--- a/3rd/lua-seri/lua-seri.h
+++ b/3rd/lua-seri/lua-seri.h
@@ -1,11 +1,8 @@
-#ifndef LUA_SERIALIZE_H
-#define LUA_SERIALIZE_H
+#pragma once
 
-#include <lua.h>
+struct lua_State;
 
 int seri_unpack(lua_State* L, void* buffer);
 int seri_unpackptr(lua_State* L, void* buffer);
 void * seri_pack(lua_State* L, int from, int* sz);
 void * seri_packstring(const char* str, int sz);
-
-#endif
diff --git a/binding/lua_channel.cpp b/binding/lua_channel.cpp
index ecf3a59c..26c14e43 100644
--- a/binding/lua_channel.cpp
+++ b/binding/lua_channel.cpp
@@ -1,3 +1,4 @@
+#include <3rd/lua-seri/lua-seri.h>
 #include <bee/error.h>
 #include <bee/lua/binding.h>
 #include <bee/lua/module.h>
@@ -12,10 +13,6 @@
 #include <queue>
 #include <string>
 
-extern "C" {
-#include <3rd/lua-seri/lua-seri.h>
-}
-
 namespace bee::lua_channel {
     class channel {
     public:
diff --git a/binding/lua_serialization.cpp b/binding/lua_serialization.cpp
index 43897fa4..2294617b 100644
--- a/binding/lua_serialization.cpp
+++ b/binding/lua_serialization.cpp
@@ -1,10 +1,7 @@
+#include <3rd/lua-seri/lua-seri.h>
 #include <bee/lua/binding.h>
 #include <bee/lua/module.h>
 
-extern "C" {
-#include <3rd/lua-seri/lua-seri.h>
-}
-
 namespace bee::lua_serialization {
     static int unpack(lua_State* L) {
         switch (lua_type(L, 1)) {
diff --git a/binding/lua_thread.cpp b/binding/lua_thread.cpp
index e00333c9..e90ffe67 100644
--- a/binding/lua_thread.cpp
+++ b/binding/lua_thread.cpp
@@ -1,3 +1,4 @@
+#include <3rd/lua-seri/lua-seri.h>
 #include <bee/error.h>
 #include <bee/lua/binding.h>
 #include <bee/lua/module.h>
@@ -11,10 +12,6 @@
 #include <queue>
 #include <string>
 
-extern "C" {
-#include <3rd/lua-seri/lua-seri.h>
-}
-
 namespace bee::lua_thread {
     static const char* errmsg(lua_State* L, int idx) {
         const char* msg = lua_tostring(L, idx);
diff --git a/compile/common.lua b/compile/common.lua
index 50cceaf3..75c215ce 100644
--- a/compile/common.lua
+++ b/compile/common.lua
@@ -67,7 +67,7 @@ if lm.sanitize then
 end
 
 lm:lua_src "source_bee" {
-    sources = "3rd/lua-seri/lua-seri.c",
+    sources = "3rd/lua-seri/lua-seri.cpp",
     msvc = {
         flags = "/wd4244"
     }