diff --git a/src/vs/workbench/parts/comments/electron-browser/commentThreadWidget.ts b/src/vs/workbench/parts/comments/electron-browser/commentThreadWidget.ts
index b2bbaea9d5a6878ca0ab03040927de71251d5c9c..6ed54c6fd80ef827ea763d5c0a5b8f0c4e38d9c5 100644
--- a/src/vs/workbench/parts/comments/electron-browser/commentThreadWidget.ts
+++ b/src/vs/workbench/parts/comments/electron-browser/commentThreadWidget.ts
@@ -236,7 +236,7 @@ export class ReviewZoneWidget extends ZoneWidget {
 
 		// del removed elements
 		for (let i = commentElementsToDel.length - 1; i >= 0; i--) {
-			this._commentElements.splice(commentElementsToDelIndex[i]);
+			this._commentElements.splice(commentElementsToDelIndex[i], 1);
 			this._commentsElement.removeChild(commentElementsToDel[i].domNode);
 		}