diff --git a/lib/timeline/Core.js b/lib/timeline/Core.js
index a5cde77a..35f8f208 100644
--- a/lib/timeline/Core.js
+++ b/lib/timeline/Core.js
@@ -1087,6 +1087,7 @@ Core.prototype._startAutoResize = function () {
         (me.dom.root.offsetHeight != me.props.lastHeight)) {
         me.props.lastWidth = me.dom.root.offsetWidth;
         me.props.lastHeight = me.dom.root.offsetHeight;
+        me.props.scrollbarWidth = util.getScrollBarWidth();
 
         me.body.emitter.emit('_change');
       }