diff --git a/HISTORY.md b/HISTORY.md
index 76e7dc61..07a4c501 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,3 +1,7 @@
+Dev version
+-----------
+* Bugfix: update lua-bson (signed 32bit int bug)
+
 v0.2.1 (2014-5-19)
 -----------
 * Bugfix: check all the events already read after socket close
diff --git a/lualib-src/lua-bson.c b/lualib-src/lua-bson.c
index e129f62b..077e538e 100644
--- a/lualib-src/lua-bson.c
+++ b/lualib-src/lua-bson.c
@@ -1,5 +1,3 @@
-#include "skynet_malloc.h"
-
 #include <lua.h>
 #include <lauxlib.h>
 
@@ -73,7 +71,7 @@ struct bson_reader {
 static inline void
 bson_destroy(struct bson *b) {
 	if (b->ptr != b->buffer) {
-		skynet_free(b->ptr);
+		free(b->ptr);
 	}
 }
 
@@ -93,10 +91,10 @@ bson_reserve(struct bson *b, int sz) {
 	} while (b->cap <= b->size + sz);
 
 	if (b->ptr == b->buffer) {
-		b->ptr = skynet_malloc(b->cap);
+		b->ptr = malloc(b->cap);
 		memcpy(b->ptr, b->buffer, b->size);
 	} else {
-		b->ptr = skynet_realloc(b->ptr, b->cap);
+		b->ptr = realloc(b->ptr, b->cap);
 	}
 }
 
@@ -258,13 +256,13 @@ append_key(struct bson *bs, int type, const char *key, size_t sz) {
 
 static void
 append_number(struct bson *bs, lua_State *L, const char *key, size_t sz) {
-	lua_Integer i = lua_tointeger(L, -1);
+	int64_t i = lua_tointeger(L, -1);
 	lua_Number d = lua_tonumber(L,-1);
 	if (i != d) {
 		append_key(bs, BSON_REAL, key, sz);
 		write_double(bs, d);
 	} else {
-		int si = (int64_t)i >> 32;
+		int si = i >> 31;
 		if (si == 0 || si == -1) {
 			append_key(bs, BSON_INT32, key, sz);
 			write_int32(bs, i);
@@ -459,7 +457,7 @@ pack_dict(lua_State *L, struct bson *b, bool isarray) {
 }
 
 static void
-pack_sorted_dict(lua_State *L, struct bson *b, int n) {
+pack_ordered_dict(lua_State *L, struct bson *b, int n) {
 	int length = reserve_length(b);
 	int i;
 	for (i=0;i<n;i+=2) {
@@ -865,7 +863,7 @@ lencode_order(lua_State *L) {
 	if (n%2 != 0) {
 		return luaL_error(L, "Invalid ordered dict");
 	}
-	pack_sorted_dict(L, &b, n);
+	pack_ordered_dict(L, &b, n);
 	lua_settop(L,1);
 	void * ud = lua_newuserdata(L, b.size);
 	memcpy(ud, b.ptr, b.size);
@@ -1190,3 +1188,4 @@ luaopen_bson(lua_State *L) {
 
 	return 1;
 }
+