diff --git a/lib/timeline/Core.js b/lib/timeline/Core.js
index e9176360..348f35ad 100644
--- a/lib/timeline/Core.js
+++ b/lib/timeline/Core.js
@@ -459,7 +459,7 @@ Core.prototype.getVisibleItems = function() {
 Core.prototype.fit = function(options) {
   var range = this.getDataRange();
 
-  // skip range set if there is no start and end date
+  // skip range set if there is no min and max date
   if (range.min === null && range.max === null) {
     return;
   }
@@ -496,8 +496,8 @@ Core.prototype.getDataRange = function() {
   }
 
   return {
-    start: null,
-    end: null
+    min: start,
+    max: end
   }
 };