diff --git a/lualib/skynet/debug.lua b/lualib/skynet/debug.lua
index 635bdb31..79c51ad1 100644
--- a/lualib/skynet/debug.lua
+++ b/lualib/skynet/debug.lua
@@ -1,6 +1,4 @@
-local io = io
 local table = table
-local debug = debug
 
 return function (skynet, export)
 
diff --git a/lualib/snax/hotfix.lua b/lualib/snax/hotfix.lua
index 3a6e4e3e..f56a5072 100644
--- a/lualib/snax/hotfix.lua
+++ b/lualib/snax/hotfix.lua
@@ -1,7 +1,4 @@
 local si = require "snax.interface"
-local io = io
-
-local hotfix = {}
 
 local function envid(f)
 	local i = 1