diff --git a/luprex/core/cpp/luastack.cpp b/luprex/core/cpp/luastack.cpp
index f97ae9b5..4de275fe 100644
--- a/luprex/core/cpp/luastack.cpp
+++ b/luprex/core/cpp/luastack.cpp
@@ -188,12 +188,6 @@ void LuaStack::makesubtable(LuaSlot sub, LuaSlot tab, const char *name) const {
     }
 }
 
-void LuaStack::setlightuserdata(LuaSlot target, void *p) const {
-    lua_pushlightuserdata(L_, p);
-    lua_replace(L_, target);
-}
-
-
 void LuaStack::check_nret(int xnret, int otop, int nret) const {
     int ntop = lua_gettop(L_);
     if ((nret != xnret)||(ntop != otop + xnret)) {
diff --git a/luprex/core/cpp/luastack.hpp b/luprex/core/cpp/luastack.hpp
index a016c6f5..9bb08cb7 100644
--- a/luprex/core/cpp/luastack.hpp
+++ b/luprex/core/cpp/luastack.hpp
@@ -415,8 +415,6 @@ public:
 
     void makesubtable(LuaSlot sub, LuaSlot tab, const char *name) const;
 
-    void setlightuserdata(LuaSlot target, void *p) const;
-
     int next(LuaSlot tab, LuaSlot key, LuaSlot value) const;
 
     void makeclass(LuaSlot tab, LuaSlot name) const;