diff --git a/lib/cartodb/server_options.js b/lib/cartodb/server_options.js
index 290c0dd8..c67b134a 100644
--- a/lib/cartodb/server_options.js
+++ b/lib/cartodb/server_options.js
@@ -291,19 +291,17 @@ module.exports = function(){
 
           // TODO: check ?
           //console.log("type of req.query.lzma is " + typeof(req.query.lzma));
-          //console.log("req.query.lzma is " + req.query.lzma);
 
           // Decode (from base64)
-          var lzma = new Buffer(req.query.lzma, 'base64');
+          var lzma = (new Buffer(req.query.lzma, 'base64').toString('binary')).split('').map(function(c) { return c.charCodeAt(0) - 128 })
 
           // Decompress
-          //console.log("LZMA decompression starts with " + lzma);
           LZMA.decompress(
             lzma,
             function(result) {
-              //console.log("LZMA decompression completed, payload: "); console.dir(result);
               try {
-                req.query = JSON.parse(result);
+                delete req.query.lzma
+                _.extend(req.query, JSON.parse(result))
                 me.req2params(req, callback);
               } catch (err) { 
                 callback(new Error('Error parsing lzma as JSON: ' + err));
@@ -317,7 +315,7 @@ module.exports = function(){
         }
 
         // Whitelist query parameters and attach format
-        var good_query = ['sql', 'geom_type', 'cache_buster', 'cache_policy', 'callback', 'interactivity', 'map_key', 'api_key', 'style', 'style_version', 'style_convert' ];
+        var good_query = ['sql', 'geom_type', 'cache_buster', 'cache_policy', 'callback', 'interactivity', 'map_key', 'api_key', 'style', 'style_version', 'style_convert', 'config' ];
         var bad_query  = _.difference(_.keys(req.query), good_query);
 
         _.each(bad_query, function(key){ delete req.query[key]; });
diff --git a/test/acceptance/server.js b/test/acceptance/server.js
index 1b91a207..fd847bc3 100644
--- a/test/acceptance/server.js
+++ b/test/acceptance/server.js
@@ -7,30 +7,15 @@ var semver      = require('semver');
 var mapnik      = require('mapnik');
 var Step        = require('step');
 var http        = require('http');
-var LZMA        = require('lzma/lzma_worker.js').LZMA;
 var SQLAPIEmu   = require(__dirname + '/../support/SQLAPIEmu.js');
 
-require(__dirname + '/../support/test_helper');
+var helper = require(__dirname + '/../support/test_helper');
 
 var CartodbWindshaft = require(__dirname + '/../../lib/cartodb/cartodb_windshaft');
 var serverOptions = require(__dirname + '/../../lib/cartodb/server_options');
 var server = new CartodbWindshaft(serverOptions);
 server.setMaxListeners(0);
 
-// Utility function to compress & encode LZMA
-function lzma_compress_to_base64(payload, mode, callback) {
-  var HEX = [ '0','1','2','3','4','5','6','7',
-              '8','9','a','b','c','d','e','f' ];
-  LZMA.compress(payload, mode, 
-    function(ints) {
-      var base64 = new Buffer(ints).toString('base64');
-      callback(null, base64);
-    },
-    function(percent) {
-      //console.log("Compressing: " + percent + "%");
-    }
-  );
-}
 
 suite('server', function() {
 
@@ -808,7 +793,7 @@ suite('server', function() {
           function compressQuery () {
             //console.log("Compressing starts");
             var next = this;
-            lzma_compress_to_base64(JSON.stringify(qo), 1, this);
+            helper.lzma_compress_to_base64(JSON.stringify(qo), 1, this);
             //cosole.log("compress returned " + x );
           },
           function sendRequest(err, lzma) {
diff --git a/test/support/test_helper.js b/test/support/test_helper.js
index 3c59cac0..7b465611 100644
--- a/test/support/test_helper.js
+++ b/test/support/test_helper.js
@@ -6,6 +6,7 @@
  */
 
 var _ = require('underscore');
+var LZMA  = require('lzma/lzma_worker.js').LZMA;
 
 // set environment specific variables
 global.settings     = require(__dirname + '/../../config/settings');
@@ -13,4 +14,21 @@ global.environment  = require(__dirname + '/../../config/environments/test');
 _.extend(global.settings, global.environment);
 
 
+// Utility function to compress & encode LZMA
+function lzma_compress_to_base64(payload, mode, callback) {
+  LZMA.compress(payload, mode, 
+    function(ints) {
+      ints = ints.map(function(c) { return String.fromCharCode(c + 128) }).join('')
+      var base64 = new Buffer(ints, 'binary').toString('base64');
+      callback(null, base64);
+    },
+    function(percent) {
+      //console.log("Compressing: " + percent + "%");
+    }
+  );
+}
+
+module.exports = {
+  lzma_compress_to_base64: lzma_compress_to_base64
+}
 
diff --git a/test/unit/cartodb/req2params.test.js b/test/unit/cartodb/req2params.test.js
index 2562b076..3b7bb845 100644
--- a/test/unit/cartodb/req2params.test.js
+++ b/test/unit/cartodb/req2params.test.js
@@ -62,5 +62,24 @@ suite('req2params', function() {
           });
       });
     });
+
+    test('it should extend params with decoded lzma', function(done) {
+      var qo = {
+        style: 'test',
+        style_version: '2.1.0',
+        cache_buster: 5
+      };
+      test_helper.lzma_compress_to_base64(JSON.stringify(qo), 1, function(err, data) {
+        opts.req2params({ query: { non_included: 'toberemoved', api_key: 'test', style: 'override', lzma: data }}, function(err, req) {
+          var query = req.params
+          assert.equal(qo.style, query.style)
+          assert.equal(qo.style_version, query.style_version)
+          assert.equal(qo.cache_buster, query.cache_buster)
+          assert.equal('test', query.api_key)
+          assert.equal(undefined, query.non_included)
+          done();
+        });
+      });
+    });
     
 });