diff --git a/binding/lua_serialization.cpp b/binding/lua_serialization.cpp
index 30f2d019..98b07c28 100644
--- a/binding/lua_serialization.cpp
+++ b/binding/lua_serialization.cpp
@@ -42,29 +42,11 @@ namespace bee::lua_serialization {
         free(data);
         return 1;
     }
-    static int lightuserdata(lua_State* L) {
-        switch (lua_type(L, 1)) {
-        case LUA_TLIGHTUSERDATA:
-            lua_pushinteger(L, lua::tolightud<lua_Integer>(L, 1));
-            return 1;
-        case LUA_TNUMBER:
-            if (lua_isinteger(L, 1)) {
-                lua_pushlightuserdata(L, (void*)lua::checkinteger<intptr_t>(L, 1));
-                return 1;
-            }
-            else {
-                return luaL_error(L, "unsupported type float");
-            }
-        default:
-            return luaL_error(L, "unsupported type %s", luaL_typename(L, lua_type(L, 1)));
-        }
-    }
     static int luaopen(lua_State* L) {
         luaL_Reg lib[] = {
             { "unpack", unpack },
             { "pack", pack },
             { "packstring", packstring },
-            { "lightuserdata", lightuserdata },
             { NULL, NULL }
         };
         luaL_newlibtable(L, lib);
diff --git a/test/test_serialization.lua b/test/test_serialization.lua
index 0df98bf7..d9e8dc8f 100644
--- a/test/test_serialization.lua
+++ b/test/test_serialization.lua
@@ -65,16 +65,3 @@ function test_seri:test_ref()
         end
     end
 end
-
-function test_seri:test_lightuserdata()
-    lt.assertError(seri.lightuserdata, "")
-    lt.assertError(seri.lightuserdata, 1.1)
-    lt.assertEquals(seri.lightuserdata(1), seri.lightuserdata(1))
-    lt.assertNotEquals(seri.lightuserdata(1), seri.lightuserdata(2))
-    lt.assertEquals(type(seri.lightuserdata(1)), "userdata")
-    lt.assertEquals(seri.lightuserdata((seri.lightuserdata(10086))), 10086)
-
-    local t = { [seri.lightuserdata(0)] = seri.lightuserdata(1) }
-    local newt = seri.unpack(seri.pack(t))
-    lt.assertEquals(t, newt)
-end