diff --git a/luprex/eris-master/src/lapi.c b/luprex/eris-master/src/lapi.c
index d011431e..cf79e72a 100644
--- a/luprex/eris-master/src/lapi.c
+++ b/luprex/eris-master/src/lapi.c
@@ -456,6 +456,15 @@ LUA_API const void *lua_topointer (lua_State *L, int idx) {
 }
 
 
+LUA_API lua_Integer lua_getnextid (lua_State *L) {
+    return L->nextid;
+}
+
+
+LUA_API void lua_setnextid (lua_State *L, lua_Integer id) {
+    L->nextid = id;
+}
+
 
 /*
 ** push functions (C -> stack)
diff --git a/luprex/eris-master/src/lstate.h b/luprex/eris-master/src/lstate.h
index daffd9aa..7a26c7c9 100644
--- a/luprex/eris-master/src/lstate.h
+++ b/luprex/eris-master/src/lstate.h
@@ -173,6 +173,7 @@ struct lua_State {
   struct lua_longjmp *errorJmp;  /* current error recover point */
   ptrdiff_t errfunc;  /* current error handling function (stack index) */
   CallInfo base_ci;  /* CallInfo for first level (C calling Lua) */
+  lua_Integer nextid;  /* ID allocator for luprex */
 };
 
 
diff --git a/luprex/eris-master/src/lua.h b/luprex/eris-master/src/lua.h
index 00c0290d..2534f6d6 100644
--- a/luprex/eris-master/src/lua.h
+++ b/luprex/eris-master/src/lua.h
@@ -176,6 +176,8 @@ LUA_API void	       *(lua_touserdata) (lua_State *L, int idx);
 LUA_API lua_State      *(lua_tothread) (lua_State *L, int idx);
 LUA_API const void     *(lua_topointer) (lua_State *L, int idx);
 
+LUA_API lua_Integer     (lua_getnextid) (lua_State *L);
+LUA_API void            (lua_setnextid) (lua_State *L, lua_Integer id);
 
 /*
 ** Comparison and arithmetic functions