diff --git a/sim/main.lua b/sim/main.lua
index 2581794..60f7b24 100644
--- a/sim/main.lua
+++ b/sim/main.lua
@@ -1,7 +1,7 @@
 
 -- External requirements
-local socket = require("socket")
-local ffi = require("ffi")
+socket = require("socket")
+ffi = require("ffi")
 
 -- Disallow access to undefined global variables (helps detect errors)
 assert(getmetatable(_G)==nil, "_G already has a metatable")