diff --git a/lib/cartodb/models/dataview/aggregation.js b/lib/cartodb/models/dataview/aggregation.js
index 7f6c198a..b4c59af2 100644
--- a/lib/cartodb/models/dataview/aggregation.js
+++ b/lib/cartodb/models/dataview/aggregation.js
@@ -229,8 +229,6 @@ module.exports = class Aggregation extends BaseDataview {
     }
 
     sql (psql, override, callback) {
-        const self = this;
-
         if (!callback) {
             callback = override;
             override = {};
@@ -238,11 +236,11 @@ module.exports = class Aggregation extends BaseDataview {
 
         if (this._shouldCheckColumnType()) {
             this._isFloatColumn = false;
-            this.getColumnType(psql, this.aggregationColumn, this.queries.no_filters, function (err, type) {
+            this.getColumnType(psql, this.aggregationColumn, this.queries.no_filters, (err, type) => {
                 if (!err && !!type) {
-                    self._isFloatColumn = type.float;
+                    this._isFloatColumn = type.float;
                 }
-                self.sql(psql, override, callback);
+                this.sql(psql, override, callback);
             });
             return null;
         }
@@ -295,7 +293,6 @@ module.exports = class Aggregation extends BaseDataview {
     }
 
     search (psql, userQuery, callback) {
-        const self = this;
         const escapedUserQuery = psql.escapeLiteral(`%${userQuery}%`);
         const value = this.aggregation !== 'count' && this.aggregationColumn ?
             `${this.aggregation}(${this.aggregationColumn})` :
@@ -319,12 +316,12 @@ module.exports = class Aggregation extends BaseDataview {
 
         debug(query);
 
-        psql.query(query, function(err, result) {
+        psql.query(query, (err, result) => {
             if (err) {
                 return callback(err, result);
             }
 
-            return callback(null, {type: self.getType(), categories: result.rows });
+            return callback(null, {type: this.getType(), categories: result.rows });
         }, true); // use read-only transaction
     }