diff --git a/scripts/http-sql-injection.nse b/scripts/http-sql-injection.nse
index 27f15f474..6827dda79 100644
--- a/scripts/http-sql-injection.nse
+++ b/scripts/http-sql-injection.nse
@@ -1,5 +1,6 @@
 local http = require "http"
 local httpspider = require "httpspider"
+local io = require "io"
 local nmap = require "nmap"
 local shortport = require "shortport"
 local stdnse = require "stdnse"