diff --git a/HISTORY.md b/HISTORY.md
index 99d814da..86a09842 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -15,6 +15,7 @@ http://visjs.org
 - Fixed #1491: Problem using ctrl+drag in combination with using a `DataView`,
   and an issue with ctrl+drag when using `snap: null`.
 - Fixed #1486: Item range sometimes wrongly calculated on IE in case of old dates.
+- Fixed #1523: end of data range wrongly determined.
 
 ### Graph2d
 
diff --git a/lib/timeline/Timeline.js b/lib/timeline/Timeline.js
index 89075bc6..50de9f48 100644
--- a/lib/timeline/Timeline.js
+++ b/lib/timeline/Timeline.js
@@ -455,7 +455,7 @@ Timeline.prototype.getDataRange = function() {
         min = start;
       }
       if (max === null || end > max) {
-        max = start;
+        max = end;
       }
     });
   }