diff --git a/lib/cartodb/models/mapconfig/provider/map-store-provider.js b/lib/cartodb/models/mapconfig/provider/map-store-provider.js
index 238d1cb5..e4e1de1c 100644
--- a/lib/cartodb/models/mapconfig/provider/map-store-provider.js
+++ b/lib/cartodb/models/mapconfig/provider/map-store-provider.js
@@ -1,4 +1,3 @@
-const _ = require('underscore');
 const dot = require('dot');
 const QueryTables = require('cartodb-query-tables');
 
@@ -72,14 +71,14 @@ module.exports = class MapStoreMapConfigProvider {
     }
 
     createKey (base) {
-        const tplValues = _.defaults({}, this.params, {
+        const tplValues = Object.assign({
             dbname: '',
             token: '',
             dbuser: '',
             format: '',
             layer: '',
             scale_factor: 1
-        });
+        }, this.params);
 
         return (base) ? baseKeyTpl(tplValues) : rendererKeyTpl(tplValues);
     }