diff --git a/lib/cartodb/models/dataview/formula.js b/lib/cartodb/models/dataview/formula.js
index c0829fa5..daaeaf0c 100644
--- a/lib/cartodb/models/dataview/formula.js
+++ b/lib/cartodb/models/dataview/formula.js
@@ -78,8 +78,6 @@ module.exports = class Formula extends BaseDataview {
 
 
     sql (psql, override, callback) {
-        const self = this;
-
         if (!callback) {
             callback = override;
             override = {};
@@ -87,11 +85,11 @@ module.exports = class Formula extends BaseDataview {
 
         if (this._isFloatColumn === null) {
             this._isFloatColumn = false;
-            this.getColumnType(psql, this.column, this.queries.no_filters, function (err, type) {
+            this.getColumnType(psql, this.column, 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;
         }