diff --git a/bc.lua b/bc.lua
index a8c99fbde1ec..52d9af579aec 100644
--- a/bc.lua
+++ b/bc.lua
@@ -1,8 +1,8 @@
-event = require("event")
-modem = require("component").modem
-serializer = require("serialization")
+local event = require("event")
+local modem = require("component").modem
+local serializer = require("serialization")
 
-List = {last = -1}
+local List = {last = -1}
 
 function List:new()
   local o = {}
@@ -42,7 +42,7 @@ function List:remove(id)
   return value
 end
 
-message_type = {
+local message_type = {
   request_noun = 1,
   call_verb = 2,
   noun_response = 3,
@@ -54,13 +54,13 @@ message_type = {
   listener_update = 9,
 }
 
-CFG_PORT = 1234
+local CFG_PORT = 1234
 
-bc = {}
+local bc = {}
 
 function bc:init(local_nouns, local_verbs)
-  local_nouns = local_nouns or {}
-  local_verbs = local_verbs or {}
+  local local_nouns = local_nouns or {}
+  local local_verbs = local_verbs or {}
   local o = {}
   setmetatable(o, self)
   self.__index = self
@@ -71,11 +71,10 @@ function bc:init(local_nouns, local_verbs)
   o.listening_remotes = {}
   -- Modem listener
   function modem_listener(moden_msg, localAddress, remoteAddress, port, dist, message)
-    dbg = message
-    message = serializer.unserialize(message)
+    local message = serializer.unserialize(message)
     if port == CFG_PORT then
       if message.ty == message_type.request_noun then
-        msg = {ty=message_type.noun_response,
+        local msg = {ty=message_type.noun_response,
                noun=message.noun,
                value=o.local_nouns[message.noun]
               }
@@ -161,7 +160,7 @@ function bc:get_noun(n)
     while i < 5 do
       local _, _, remoteAddr, port, _, msg = event.pull("modem_message")
       if port == CFG_PORT and remoteAddr == self.remote_nouns[n] then
-        message = serializer.unserialize(msg)
+        local message = serializer.unserialize(msg)
         if message.ty == message_type.noun_response and message.noun == n then
           return message.value
         end