diff --git a/nselib/httpspider.lua b/nselib/httpspider.lua
index 08565669b..041b3f0df 100644
--- a/nselib/httpspider.lua
+++ b/nselib/httpspider.lua
@@ -84,7 +84,7 @@ Options = {
 					local parsed_u = url.parse(tostring(u))
 													
 					if ( o.base_url:getPort() ~= 80 and o.base_url:getPort() ~= 443 ) then
-						if ( parsed_u.port ~= o.base_url:getPort() ) then
+						if ( tonumber(parsed_u.port) ~= tonumber(o.base_url:getPort()) ) then
 							return false
 						end
 					elseif ( parsed_u.scheme ~= o.base_url:getProto() ) then
@@ -98,7 +98,7 @@ Options = {
 				o.withindomain = function(u)
 					local parsed_u = url.parse(tostring(u))				
 					if ( o.base_url:getPort() ~= 80 and o.base_url:getPort() ~= 443 ) then
-						if ( parsed_u.port ~= o.base_url:getPort() ) then
+						if ( tonumber(parsed_u.port) ~= tonumber(o.base_url:getPort()) ) then
 							return false
 						end
 					elseif ( parsed_u.scheme ~= o.base_url:getProto() ) then