diff --git a/lib/cartodb/models/dataview/histogram.js b/lib/cartodb/models/dataview/histogram.js
index 5eec9713..35c9b43c 100644
--- a/lib/cartodb/models/dataview/histogram.js
+++ b/lib/cartodb/models/dataview/histogram.js
@@ -124,14 +124,14 @@ const overrideBinsQueryTpl = ctx => `
     )
 `;
 
-var nullsQueryTpl = dot.template([
-    '__cdb_nulls AS (',
-    '  SELECT',
-    '    count(*) AS __cdb_nulls_count',
-    '  FROM ({{=it._query}}) __cdb_histogram_nulls',
-    '  WHERE {{=it._column}} IS NULL',
-    ')'
-].join('\n'));
+const nullsQueryTpl = ctx => `
+    __cdb_nulls AS (
+        SELECT
+            count(*) AS __cdb_nulls_count
+        FROM (${it._query}) __cdb_histogram_nulls
+        WHERE ${it._column} IS NULL
+    )
+`;
 
 var infinitiesQueryTpl = dot.template([
     '__cdb_infinities AS (',