diff --git a/scripts/http-exif-spider.nse b/scripts/http-exif-spider.nse
index 124b8965e..a6813c91e 100644
--- a/scripts/http-exif-spider.nse
+++ b/scripts/http-exif-spider.nse
@@ -32,6 +32,8 @@ local stdnse = require 'stdnse'
 local httpspider = require 'httpspider'
 local string = require 'string'
 local bin = require 'bin'
+local bit = require 'bit'
+local table = require 'table'
 
 -- These definitions are copied/pasted/reformatted from the jhead-2.96 sourcecode
 -- (the code is effectively public domain, but credit where credit's due!)
@@ -351,7 +353,7 @@ local function process_gps(data, pos, endian, result)
 
   -- Loop through the entries to find the fun stuff
   for i=1, num_entries do
-    pos, tag, format, components, value = bin.unpack(endian .. "SSII", data, pos)
+    local pos, tag, format, components, value = bin.unpack(endian .. "SSII", data, pos)
 
     if(tag == GPS_TAG_LATITUDE or tag == GPS_TAG_LONGITUDE) then
       local dummy, gps, h, m, s
@@ -396,13 +398,13 @@ local function parse_exif(exif_data)
   local sig, marker, size
   local tag, format, components, byte_count, value, offset, dummy, data
   local status, result
-  local header1, header2, tiff_header_1, first_offset
+  local tiff_header_1, first_offset
 
   -- Initialize the result table
   result = {}
 
   -- Read the verify the EXIF header
-  pos, header1, header2, endian = bin.unpack(">ISS", exif_data, 1)
+  local pos, header1, header2, endian = bin.unpack(">ISS", exif_data, 1)
   if(header1 ~= 0x45786966 or header2 ~= 0x0000) then
     return false, "Invalid EXIF header"
   end
diff --git a/scripts/smb-vuln-ms10-061.nse b/scripts/smb-vuln-ms10-061.nse
index ac578de9b..ab8e70a0a 100644
--- a/scripts/smb-vuln-ms10-061.nse
+++ b/scripts/smb-vuln-ms10-061.nse
@@ -117,7 +117,7 @@ aka "Print Spooler Service Impersonation Vulnerability."
 		local data = lanman_result.data
 		local pos, status, convert, entry_count, available_entries = bin.unpack("<SSSS", parameters)
 		pos = 0
-		local share_type 
+		local share_type, name, _
 		for i = 1, entry_count, 1 do
 			_,share_type = bin.unpack(">s",data,pos+14)
 			pos, name = bin.unpack("<z", data, pos)
diff --git a/scripts/ssl-date.nse b/scripts/ssl-date.nse
index f021be9db..2fe4aeff7 100644
--- a/scripts/ssl-date.nse
+++ b/scripts/ssl-date.nse
@@ -2,6 +2,7 @@ local shortport = require "shortport"
 local stdnse = require "stdnse"
 local table = require "table"
 local bin = require "bin"
+local nmap = require "nmap"
 local os = require "os"
 local string = require "string"
 description = [[
@@ -105,7 +106,7 @@ end
 -- extract time from ServerHello response
 local extract_time = function(response)
     local result
-    local shlength, npndata, protocol
+    local shlength, npndata, protocol, _
 
     if not response then
 	stdnse.print_debug(SCRIPT_NAME .. ": Didn't get response.")