diff --git a/lib/dash/dash_parser.js b/lib/dash/dash_parser.js
index 249286c378..b6e95208e8 100644
--- a/lib/dash/dash_parser.js
+++ b/lib/dash/dash_parser.js
@@ -3012,7 +3012,7 @@ shaka.dash.DashParser = class {
         endTime: endTime,
         id: eventNode.attributes['id'] || '',
         eventElement: TXml.txmlNodeToDomElement(eventNode),
-        eventNode: eventNode,
+        eventNode: TXml.cloneNode(eventNode),
       };
 
       this.playerInterface_.onTimelineRegionAdded(region);