--- lua_cjson.c
+++ lua_cjson.c
@@ -1290,26 +1290,6 @@

 /* ===== INITIALISATION ===== */

-#if !defined(LUA_VERSION_NUM) || LUA_VERSION_NUM < 502
-/* Compatibility for Lua 5.1.
- *
- * luaL_setfuncs() is used to create a module table where the functions have
- * json_config_t as their first upvalue. Code borrowed from Lua 5.2 source. */
-static void luaL_setfuncs (lua_State *l, const luaL_Reg *reg, int nup)
-{
-    int i;
-
-    luaL_checkstack(l, nup, "too many upvalues");
-    for (; reg->name != NULL; reg++) {  /* fill the table with given functions */
-        for (i = 0; i < nup; i++)  /* copy upvalues to the top */
-            lua_pushvalue(l, -nup);
-        lua_pushcclosure(l, reg->func, nup);  /* closure with those upvalues */
-        lua_setfield(l, -(nup + 2), reg->name);
-    }
-    lua_pop(l, nup);  /* remove upvalues */
-}
-#endif
-
 /* Call target function in protected mode with all supplied args.
  * Assumes target function only returns a single non-nil value.
  * Convert and return thrown errors as: nil, "error message" */