diff --git a/lib/cartodb/backends/user-limits.js b/lib/cartodb/backends/user-limits.js
index 3a137269..7ce0f2a3 100644
--- a/lib/cartodb/backends/user-limits.js
+++ b/lib/cartodb/backends/user-limits.js
@@ -41,21 +41,11 @@ UserLimitsBackend.prototype.getRenderLimits = function (username, apiKey, callba
 UserLimitsBackend.prototype.getTimeoutRenderLimit = function (username, apiKey, callback) {
     var self = this;
 
-    function isAuthorized() {
-        var next = this;
-
-        if (!apiKey) {
-            return next(null, false);
+    isAuthorized(self.metadataBackend, username, apiKey, (err, authorized) => {
+        if (err) {
+            return callback(err);
         }
-
-        self.metadataBackend.getUserMapKey(username, function (err, userApiKey) {
-            if (err) {
-                return next(err);
-            }
-
-            return next(null, userApiKey === apiKey);
-        });
-    },
+    })
     function getUserTimeoutRenderLimits(err, authorized) {
         var next = this;
 
@@ -76,6 +66,20 @@ UserLimitsBackend.prototype.getTimeoutRenderLimit = function (username, apiKey,
     callback
 };
 
+function isAuthorized(metadataBackend, username, apiKey, callback) {
+    if (!apiKey) {
+        return callback(null, false);
+    }
+
+    metadataBackend.getUserMapKey(username, function (err, userApiKey) {
+        if (err) {
+            return callback(err);
+        }
+
+        return callback(null, userApiKey === apiKey);
+    });
+}
+
 UserLimitsBackend.prototype.preprareRateLimit = function () {
     if (this.options.limits.rateLimitsEnabled) {
         this.metadataBackend.loadRateLimitsScript();