diff --git a/nselib/anyconnect.lua b/nselib/anyconnect.lua
index bb0f8045f..4dc8f64ae 100644
--- a/nselib/anyconnect.lua
+++ b/nselib/anyconnect.lua
@@ -13,7 +13,6 @@ local stdnse = require('stdnse')
 local url = require('url')
 local math = require('math')
 local table = require('table')
-local os = require('os')
 
 local args_group= stdnse.get_script_args('anyconnect.group') or "VPN"
 local args_mac= stdnse.get_script_args('anyconnect.mac')
diff --git a/nselib/data/http-devframework-fingerprints.lua b/nselib/data/http-devframework-fingerprints.lua
index 8af0822fb..f0fc180bf 100644
--- a/nselib/data/http-devframework-fingerprints.lua
+++ b/nselib/data/http-devframework-fingerprints.lua
@@ -1,5 +1,4 @@
 local http = require "http"
-local io = require "io"
 local string = require "string"
 local table = require "table"
 
diff --git a/scripts/bitcoin-info.nse b/scripts/bitcoin-info.nse
index b31ac7fb2..b3a5194c3 100644
--- a/scripts/bitcoin-info.nse
+++ b/scripts/bitcoin-info.nse
@@ -3,7 +3,6 @@ local datetime = require "datetime"
 local bitcoin = require "bitcoin"
 local shortport = require "shortport"
 local stdnse = require "stdnse"
-local table = require "table"
 
 description = [[
 Extracts version and node information from a Bitcoin server
diff --git a/scripts/cics-info.nse b/scripts/cics-info.nse
index aa524c404..905c82a83 100644
--- a/scripts/cics-info.nse
+++ b/scripts/cics-info.nse
@@ -3,7 +3,6 @@ local stdnse    = require "stdnse"
 local shortport = require "shortport"
 local tn3270    = require "tn3270"
 local table     = require "table"
-local string   = require "string"
 
 
 description = [[
diff --git a/scripts/deluge-rpc-brute.nse b/scripts/deluge-rpc-brute.nse
index 1dbbc06be..4026754ee 100644
--- a/scripts/deluge-rpc-brute.nse
+++ b/scripts/deluge-rpc-brute.nse
@@ -3,7 +3,6 @@ local bin = require "bin"
 local creds = require "creds"
 local nmap = require "nmap"
 local shortport = require "shortport"
-local stdnse = require "stdnse"
 local string = require "string"
 
 local have_zlib, zlib = pcall(require, "zlib")
diff --git a/scripts/http-brute.nse b/scripts/http-brute.nse
index 01397db3f..e7725931c 100644
--- a/scripts/http-brute.nse
+++ b/scripts/http-brute.nse
@@ -4,7 +4,6 @@ local http = require "http"
 local nmap = require "nmap"
 local shortport = require "shortport"
 local string = require "string"
-local table = require "table"
 local stdnse = require "stdnse"
 
 description = [[
diff --git a/scripts/http-trane-info.nse b/scripts/http-trane-info.nse
index 8c93af9c6..911c2ec4f 100644
--- a/scripts/http-trane-info.nse
+++ b/scripts/http-trane-info.nse
@@ -1,7 +1,6 @@
 local nmap = require "nmap"
 local http = require "http"
 local stdnse = require "stdnse"
-local string = require "string"
 local shortport = require "shortport"
 local table = require "table"
 
diff --git a/scripts/https-redirect.nse b/scripts/https-redirect.nse
index b2515c579..3916adf55 100644
--- a/scripts/https-redirect.nse
+++ b/scripts/https-redirect.nse
@@ -2,7 +2,6 @@ local comm = require "comm"
 local string = require "string"
 local shortport = require "shortport"
 local nmap = require "nmap"
-local stdnse = require "stdnse"
 local url = require "url"
 local U = require "lpeg-utility"
 
diff --git a/scripts/smb-system-info.nse b/scripts/smb-system-info.nse
index 7b761e829..ba69513e0 100644
--- a/scripts/smb-system-info.nse
+++ b/scripts/smb-system-info.nse
@@ -1,6 +1,5 @@
 local datetime = require "datetime"
 local msrpc = require "msrpc"
-local os = require "os"
 local smb = require "smb"
 local stdnse = require "stdnse"
 local string = require "string"
diff --git a/scripts/smb-vuln-conficker.nse b/scripts/smb-vuln-conficker.nse
index 60f6deec1..976a92617 100644
--- a/scripts/smb-vuln-conficker.nse
+++ b/scripts/smb-vuln-conficker.nse
@@ -2,7 +2,6 @@ local msrpc = require "msrpc"
 local nmap = require "nmap"
 local smb = require "smb"
 local string = require "string"
-local table = require "table"
 local vulns = require "vulns"
 
 description = [[
diff --git a/scripts/smb-vuln-cve2009-3103.nse b/scripts/smb-vuln-cve2009-3103.nse
index e1be86776..955fac94d 100644
--- a/scripts/smb-vuln-cve2009-3103.nse
+++ b/scripts/smb-vuln-cve2009-3103.nse
@@ -1,7 +1,6 @@
 local nmap = require "nmap"
 local smb = require "smb"
 local stdnse = require "stdnse"
-local table = require "table"
 local vulns = require "vulns"
 
 description = [[
diff --git a/scripts/smb-vuln-ms06-025.nse b/scripts/smb-vuln-ms06-025.nse
index ea203bcd8..cd80bdae2 100644
--- a/scripts/smb-vuln-ms06-025.nse
+++ b/scripts/smb-vuln-ms06-025.nse
@@ -2,7 +2,6 @@ local msrpc = require "msrpc"
 local nmap = require "nmap"
 local smb = require "smb"
 local stdnse = require "stdnse"
-local table = require "table"
 local vulns = require "vulns"
 
 description = [[
diff --git a/scripts/smb-vuln-ms07-029.nse b/scripts/smb-vuln-ms07-029.nse
index 2fee8a5a9..97dad83cd 100644
--- a/scripts/smb-vuln-ms07-029.nse
+++ b/scripts/smb-vuln-ms07-029.nse
@@ -3,7 +3,6 @@ local nmap = require "nmap"
 local smb = require "smb"
 local stdnse = require "stdnse"
 local string = require "string"
-local table = require "table"
 local vulns = require "vulns"
 
 description = [[
diff --git a/scripts/smb-vuln-ms08-067.nse b/scripts/smb-vuln-ms08-067.nse
index 49326f344..6b928c644 100644
--- a/scripts/smb-vuln-ms08-067.nse
+++ b/scripts/smb-vuln-ms08-067.nse
@@ -2,7 +2,6 @@ local msrpc = require "msrpc"
 local nmap = require "nmap"
 local smb = require "smb"
 local string = require "string"
-local table = require "table"
 local vulns = require "vulns"
 
 description = [[
diff --git a/scripts/smb-vuln-regsvc-dos.nse b/scripts/smb-vuln-regsvc-dos.nse
index 9af2c1433..3e9a622ff 100644
--- a/scripts/smb-vuln-regsvc-dos.nse
+++ b/scripts/smb-vuln-regsvc-dos.nse
@@ -1,7 +1,6 @@
 local msrpc = require "msrpc"
 local nmap = require "nmap"
 local smb = require "smb"
-local table = require "table"
 local vulns = require "vulns"
 
 description = [[
diff --git a/scripts/snmp-sysdescr.nse b/scripts/snmp-sysdescr.nse
index 30fa84565..45faeb169 100644
--- a/scripts/snmp-sysdescr.nse
+++ b/scripts/snmp-sysdescr.nse
@@ -3,7 +3,6 @@ local nmap = require "nmap"
 local shortport = require "shortport"
 local snmp = require "snmp"
 local string = require "string"
-local stdnse = require "stdnse"
 
 description = [[
 Attempts to extract system information from an SNMP version 1 service.
diff --git a/scripts/ssl-ccs-injection.nse b/scripts/ssl-ccs-injection.nse
index 533e39177..197acd60e 100644
--- a/scripts/ssl-ccs-injection.nse
+++ b/scripts/ssl-ccs-injection.nse
@@ -2,7 +2,6 @@ local nmap = require('nmap')
 local shortport = require('shortport')
 local sslcert = require('sslcert')
 local stdnse = require('stdnse')
-local table = require('table')
 local vulns = require('vulns')
 local have_tls, tls = pcall(require,'tls')
 
diff --git a/scripts/ssl-heartbleed.nse b/scripts/ssl-heartbleed.nse
index 240c9fdf9..ce3deab57 100644
--- a/scripts/ssl-heartbleed.nse
+++ b/scripts/ssl-heartbleed.nse
@@ -4,7 +4,6 @@ local shortport = require('shortport')
 local sslcert = require('sslcert')
 local stdnse = require('stdnse')
 local string = require "string"
-local table = require('table')
 local vulns = require('vulns')
 local have_tls, tls = pcall(require,'tls')
 assert(have_tls, "This script requires the tls.lua library from https://nmap.org/nsedoc/lib/tls.html")