diff --git a/scripts/mrinfo.nse b/scripts/mrinfo.nse
index 2d58371f1..52e2627cd 100644
--- a/scripts/mrinfo.nse
+++ b/scripts/mrinfo.nse
@@ -3,6 +3,7 @@ local packet = require "packet"
 local ipOps = require "ipOps"
 local bin = require "bin"
 local stdnse = require "stdnse"
+local string = require "string"
 local target = require "target"
 local table = require "table"
 
@@ -107,7 +108,7 @@ local mrinfoListen = function(interface, host, timeout, results)
     local condvar = nmap.condvar(results)
     local start = nmap.clock_ms()
     local listener = nmap.new_socket()
-    local p, mrinfo_raw, status, l3data, response
+    local p, mrinfo_raw, status, l3data, response, _
     -- IGMP packets that are sent from the target host to our host.
     local filter = 'ip proto 2 and src host ' .. host.ip .. ' and dst host ' .. interface.address
 
diff --git a/scripts/smb-print-text.nse b/scripts/smb-print-text.nse
index cd6621965..7bb468a50 100644
--- a/scripts/smb-print-text.nse
+++ b/scripts/smb-print-text.nse
@@ -1,4 +1,5 @@
 local bin = require "bin"
+local io = require "io"
 local msrpc = require "msrpc"
 local smb = require "smb"
 local string = require "string"
@@ -87,7 +88,7 @@ action = function(host,port)
 		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)