diff --git a/lib/cartodb/backends/layer-stats/mapnik-layer-stats.js b/lib/cartodb/backends/layer-stats/mapnik-layer-stats.js
index 6a71435e..50e3bc16 100644
--- a/lib/cartodb/backends/layer-stats/mapnik-layer-stats.js
+++ b/lib/cartodb/backends/layer-stats/mapnik-layer-stats.js
@@ -35,10 +35,10 @@ MapnikLayerStats.prototype.is = function (type) {
     return this._types[type] ? this._types[type] : false;
 };
 
-function queryPromise(dbConnection, query, callback) {
+function queryPromise(dbConnection, query, setResults) {
     return new Promise(function(resolve, reject) {
         dbConnection.query(query, function (err, res) {
-            err = callback(err, res);
+            err = setResults(err, res);
             if (err) {
                 reject(err);
             }