diff --git a/notebook/static/tree/js/notebooklist.js b/notebook/static/tree/js/notebooklist.js
index d630de66a..b1cd6e821 100644
--- a/notebook/static/tree/js/notebooklist.js
+++ b/notebook/static/tree/js/notebooklist.js
@@ -548,7 +548,6 @@ define([
         $("<span/>")
             .addClass("file_size")
             .addClass("pull-right")
-            .css("width", "65px")
             .appendTo(item);
 
         $("<span/>")
diff --git a/notebook/static/tree/less/tree.less b/notebook/static/tree/less/tree.less
index 4e24193db..f73d7332f 100644
--- a/notebook/static/tree/less/tree.less
+++ b/notebook/static/tree/less/tree.less
@@ -167,6 +167,10 @@ ul.breadcrumb {
     margin-left: @dashboard_lr_pad;
 }
 
+.file_size{
+    width: 65px;
+}
+
 [dir="rtl"] .item_modified.pull-right{
     .pull-left();
 }