diff --git a/content/treestyletab/bookmarksOverlay.js b/content/treestyletab/bookmarksOverlay.js
index e18c0aab..8dbdf9ee 100644
--- a/content/treestyletab/bookmarksOverlay.js
+++ b/content/treestyletab/bookmarksOverlay.js
@@ -70,7 +70,6 @@ var TreeStyleTabBookmarksService = {
 				this.BookmarksService.removeItem(aItem.id);
 				aItem.id = folderId;
 				aItem.isFolder = true;
-				aBookarmks[aIndex] = aItem;
 			}
 
 			let index = aTreeStructure[aIndex];