diff --git a/codesys-v2-discover.nse b/codesys-v2-discover.nse
index f50e502..7a05220 100644
--- a/codesys-v2-discover.nse
+++ b/codesys-v2-discover.nse
@@ -3,6 +3,7 @@ local comm   = require "comm"
 local stdnse = require "stdnse"
 local strbuf = require "strbuf"
 local nsedebug = require "nsedebug"
+local bin = require "bin"
 
 description = [[