diff --git a/src/vs/workbench/contrib/comments/browser/commentsTreeViewer.ts b/src/vs/workbench/contrib/comments/browser/commentsTreeViewer.ts
index 91370417b61..65f2ce20738 100644
--- a/src/vs/workbench/contrib/comments/browser/commentsTreeViewer.ts
+++ b/src/vs/workbench/contrib/comments/browser/commentsTreeViewer.ts
@@ -23,7 +23,7 @@ export class CommentsDataSource implements IDataSource {
 			return element.id;
 		}
 		if (element instanceof CommentNode) {
-			return `${element.resource.toString()}-${element.comment.uniqueIdInThread}`;
+			return `${element.resource.toString()}-${element.threadId}-${element.comment.uniqueIdInThread}`;
 		}
 		return '';
 	}