diff --git a/lib/cartodb/models/dataview/histograms/date-histogram.js b/lib/cartodb/models/dataview/histograms/date-histogram.js
index 785d132a..af151a72 100644
--- a/lib/cartodb/models/dataview/histograms/date-histogram.js
+++ b/lib/cartodb/models/dataview/histograms/date-histogram.js
@@ -56,7 +56,7 @@ __wd_buckets AS
         ${ctx.query}
     ) __source, __wd_tz
     ${condition_str}
-    GROUP BY timestamp
+    GROUP BY timestamp, __wd_tz.name
 ),`;
 }