diff --git a/lib/cartodb/cache/named_map_provider_cache.js b/lib/cartodb/cache/named_map_provider_cache.js
index fbb01509..5883ce07 100644
--- a/lib/cartodb/cache/named_map_provider_cache.js
+++ b/lib/cartodb/cache/named_map_provider_cache.js
@@ -8,58 +8,58 @@ const { templateName } = require('../backends/template_maps');
 const TEN_MINUTES_IN_MILLISECONDS = 1000 * 60 * 10;
 const ACTIONS = ['update', 'delete'];
 
-function NamedMapProviderCache(
-    templateMaps,
-    pgConnection,
-    metadataBackend,
-    userLimitsBackend,
-    mapConfigAdapter,
-    affectedTablesCache
-) {
-    this.templateMaps = templateMaps;
-    this.pgConnection = pgConnection;
-    this.metadataBackend = metadataBackend;
-    this.userLimitsBackend = userLimitsBackend;
-    this.mapConfigAdapter = mapConfigAdapter;
-    this.affectedTablesCache = affectedTablesCache;
+module.exports = class NamedMapProviderCache {
+    constructor (
+        templateMaps,
+        pgConnection,
+        metadataBackend,
+        userLimitsBackend,
+        mapConfigAdapter,
+        affectedTablesCache
+    ) {
+        this.templateMaps = templateMaps;
+        this.pgConnection = pgConnection;
+        this.metadataBackend = metadataBackend;
+        this.userLimitsBackend = userLimitsBackend;
+        this.mapConfigAdapter = mapConfigAdapter;
+        this.affectedTablesCache = affectedTablesCache;
 
-    this.providerCache = new LruCache({ max: 2000, maxAge: TEN_MINUTES_IN_MILLISECONDS });
+        this.providerCache = new LruCache({ max: 2000, maxAge: TEN_MINUTES_IN_MILLISECONDS });
 
-    ACTIONS.forEach(action => templateMaps.on(action, (...args) => this.invalidate(...args)));
-}
+        ACTIONS.forEach(action => templateMaps.on(action, (...args) => this.invalidate(...args)));
+    }
 
-module.exports = NamedMapProviderCache;
+    get (user, templateId, config, authToken, params, callback) {
+        const namedMapKey = createNamedMapKey(user, templateId);
+        const namedMapProviders = this.providerCache.get(namedMapKey) || {};
+        const providerKey = createProviderKey(config, authToken, params);
 
-NamedMapProviderCache.prototype.get = function(user, templateId, config, authToken, params, callback) {
-    const namedMapKey = createNamedMapKey(user, templateId);
-    const namedMapProviders = this.providerCache.get(namedMapKey) || {};
-    const providerKey = createProviderKey(config, authToken, params);
+        if (namedMapProviders.hasOwnProperty(providerKey)) {
+            return callback(null, namedMapProviders[providerKey]);
+        }
+
+        namedMapProviders[providerKey] = new NamedMapMapConfigProvider(
+            this.templateMaps,
+            this.pgConnection,
+            this.metadataBackend,
+            this.userLimitsBackend,
+            this.mapConfigAdapter,
+            this.affectedTablesCache,
+            user,
+            templateId,
+            config,
+            authToken,
+            params
+        );
+
+        this.providerCache.set(namedMapKey, namedMapProviders);
 
-    if (namedMapProviders.hasOwnProperty(providerKey)) {
         return callback(null, namedMapProviders[providerKey]);
     }
 
-    namedMapProviders[providerKey] = new NamedMapMapConfigProvider(
-        this.templateMaps,
-        this.pgConnection,
-        this.metadataBackend,
-        this.userLimitsBackend,
-        this.mapConfigAdapter,
-        this.affectedTablesCache,
-        user,
-        templateId,
-        config,
-        authToken,
-        params
-    );
-
-    this.providerCache.set(namedMapKey, namedMapProviders);
-
-    return callback(null, namedMapProviders[providerKey]);
-};
-
-NamedMapProviderCache.prototype.invalidate = function(user, templateId) {
-    this.providerCache.del(createNamedMapKey(user, templateId));
+    invalidate (user, templateId) {
+        this.providerCache.del(createNamedMapKey(user, templateId));
+    }
 };
 
 function createNamedMapKey (user, templateId) {