diff --git a/CVRLua/Lua/LuaInterop.cs b/CVRLua/Lua/LuaInterop.cs
index 872b7b0..dd85700 100644
--- a/CVRLua/Lua/LuaInterop.cs
+++ b/CVRLua/Lua/LuaInterop.cs
@@ -84,6 +84,9 @@ public struct lua_Debug
         [DllImport(ms_binaryName, CallingConvention = CallingConvention.Cdecl)]
         public static extern int luaopen_math(IntPtr L);
 
+        [DllImport(ms_binaryName, CallingConvention = CallingConvention.Cdecl)]
+        public static extern int luaopen_utf8(IntPtr L);
+
         [DllImport(ms_binaryName, CallingConvention = CallingConvention.Cdecl)]
         public static extern void luaL_newmetatable(IntPtr L, string tname);
 
@@ -216,12 +219,6 @@ public static int luaL_getmetatable(IntPtr L, string n)
         [DllImport(ms_binaryName, CallingConvention = CallingConvention.Cdecl)]
         public static extern int lua_setmetatable(IntPtr L, int objindex);
 
-        [DllImport(ms_binaryName, CallingConvention = CallingConvention.Cdecl)]
-        public static extern void lua_rawset(IntPtr L, int idx);
-
-        [DllImport(ms_binaryName, CallingConvention = CallingConvention.Cdecl)]
-        public static extern void lua_copy(IntPtr L, int fromidx, int toidx);
-
         [DllImport(ms_binaryName, CallingConvention = CallingConvention.Cdecl)]
         public static extern int lua_getstack(IntPtr L, int level, ref lua_Debug ar);
 
@@ -250,18 +247,6 @@ public static void lua_remove(IntPtr L, int idx)
             lua_pop(L, 1);
         }
 
-        [DllImport(ms_binaryName, CallingConvention = CallingConvention.Cdecl)]
-        public static extern int lua_rawgetp(IntPtr L, int idx, IntPtr p);
-
-        [DllImport(ms_binaryName, CallingConvention = CallingConvention.Cdecl)]
-        public static extern void lua_rawsetp(IntPtr L, int idx, IntPtr p);
-
-        [DllImport(ms_binaryName, CallingConvention = CallingConvention.Cdecl)]
-        public static extern void lua_pushlightuserdata(IntPtr L, IntPtr p);
-
-        [DllImport(ms_binaryName, CallingConvention = CallingConvention.Cdecl)]
-        public static extern int lua_rawget(IntPtr L, int idx);
-
         [DllImport(ms_binaryName, CallingConvention = CallingConvention.Cdecl)]
         public static extern int lua_geti(IntPtr L, int idx, long n);
 
diff --git a/CVRLua/Lua/LuaVM.cs b/CVRLua/Lua/LuaVM.cs
index ec967f0..15aa823 100644
--- a/CVRLua/Lua/LuaVM.cs
+++ b/CVRLua/Lua/LuaVM.cs
@@ -40,6 +40,7 @@ internal LuaVM(string p_name = "")
             LuaInterop.luaL_requiref(m_state, "table", LuaInterop.luaopen_table, 1);
             LuaInterop.luaL_requiref(m_state, "string", LuaInterop.luaopen_string, 1);
             LuaInterop.luaL_requiref(m_state, "math", LuaInterop.luaopen_math, 1);
+            LuaInterop.luaL_requiref(m_state, "utf8", LuaInterop.luaopen_utf8, 1);
 
             m_objectsMap = new Dictionary<long, ReferencedObject>();