diff --git a/lib/cartodb/models/dataview/numeric-histogram.js b/lib/cartodb/models/dataview/numeric-histogram.js
index 55368f6d..59400a00 100644
--- a/lib/cartodb/models/dataview/numeric-histogram.js
+++ b/lib/cartodb/models/dataview/numeric-histogram.js
@@ -207,7 +207,7 @@ module.exports = class NumericHistogram extends BaseDataview {
 
 
     _buildQuery (psql, override, callback) {
-        const histogramSql = this.buildQueryTpl({
+        const histogramSql = this._buildQueryTpl({
             _override: override,
             _column: this._columnType === 'date' ? columnCastTpl({ column: this.column }) : this.column,
             _isFloatColumn: this._columnType === 'float',
@@ -223,7 +223,7 @@ module.exports = class NumericHistogram extends BaseDataview {
         return callback(null, histogramSql);
     }
 
-    buildQueryTpl (ctx) {
+    _buildQueryTpl (ctx) {
         return `
             WITH
                 ${filteredQueryTpl(ctx)},