diff --git a/lib/cartodb/cache/named_map_provider_cache.js b/lib/cartodb/cache/named_map_provider_cache.js
index c872b49d..fbb01509 100644
--- a/lib/cartodb/cache/named_map_provider_cache.js
+++ b/lib/cartodb/cache/named_map_provider_cache.js
@@ -1,10 +1,10 @@
 'use strict';
 
-const NamedMapMapConfigProvider = require('../models/mapconfig/provider/named-map-provider');
-const templateName = require('../backends/template_maps').templateName;
-
 const LruCache = require("lru-cache");
 
+const NamedMapMapConfigProvider = require('../models/mapconfig/provider/named-map-provider');
+const { templateName } = require('../backends/template_maps');
+
 const TEN_MINUTES_IN_MILLISECONDS = 1000 * 60 * 10;
 const ACTIONS = ['update', 'delete'];
 
@@ -62,13 +62,13 @@ NamedMapProviderCache.prototype.invalidate = function(user, templateId) {
     this.providerCache.del(createNamedMapKey(user, templateId));
 };
 
-function createNamedMapKey(user, templateId) {
-    return user + ':' + templateName(templateId);
+function createNamedMapKey (user, templateId) {
+    return `${user}:${templateName(templateId)}`;
 }
 
 const providerKeyTpl = ctx => `${ctx.authToken}:${ctx.configHash}:${ctx.format}:${ctx.layer}:${ctx.scale_factor}`;
 
-function createProviderKey(config, authToken, params) {
+function createProviderKey (config, authToken, params) {
     const defaults = {
         authToken: authToken || '',
         configHash: NamedMapMapConfigProvider.configHash(config),