diff --git a/lib/cartodb/backends/layer-stats/mapnik-layer-stats.js b/lib/cartodb/backends/layer-stats/mapnik-layer-stats.js
index 1716623e..ee945a51 100644
--- a/lib/cartodb/backends/layer-stats/mapnik-layer-stats.js
+++ b/lib/cartodb/backends/layer-stats/mapnik-layer-stats.js
@@ -141,7 +141,7 @@ function _sample(ctx, numRows) {
     return Promise.resolve();
 }
 
-function isColumnsMetadataRequired(options) {
+function _columnsMetadataRequired(options) {
     // We need determine the columns of a query
     // if either column stats or dimension stats are required,
     // since we'll ultimately use the same query to fetch both
@@ -153,7 +153,7 @@ function _columnStats(ctx, columns, dimensions) {
         return Promise.resolve();
     }
 
-    if (!isColumnsMetadataRequired(ctx.metaOptions)) {
+    if (!_columnsMetadataRequired(ctx.metaOptions)) {
         return Promise.resolve({ columns });
     }