diff --git a/lib/cartodb/models/dataview/histogram.js b/lib/cartodb/models/dataview/histogram.js
index 01827b54..b7bb29a4 100644
--- a/lib/cartodb/models/dataview/histogram.js
+++ b/lib/cartodb/models/dataview/histogram.js
@@ -155,7 +155,7 @@ var dateHistogramQueryTpl = dot.template([
     '    CASE WHEN min_val = max_val',
     '      THEN 0',
     '      ELSE GREATEST(1, LEAST(',
-    '        WIDTH_BUCKET({{=it._column}} AT TIME ZONE \'{{=it._timezone}}\', bins_array),',
+    '        WIDTH_BUCKET({{=it._column}}::timestamp AT TIME ZONE \'{{=it._timezone}}\', bins_array),',
     '        bins_number',
     '      )) - 1',
     '    END AS bin,',