diff --git a/lib/timeline/component/item/RangeItem.js b/lib/timeline/component/item/RangeItem.js
index f090f640..01c94ed2 100644
--- a/lib/timeline/component/item/RangeItem.js
+++ b/lib/timeline/component/item/RangeItem.js
@@ -185,7 +185,9 @@ RangeItem.prototype.repositionX = function(limitSize) {
       end = 2 * parentWidth;
     }
   }
-  var boxWidth = Math.max(end - start, 1);
+
+  // add 0.5 to compensate floating-point values rounding
+  var boxWidth = Math.max(end - start + 0.5, 1);
 
   if (this.overflow) {
     if (this.options.rtl) {