diff --git a/notebook/static/tree/less/tree.less b/notebook/static/tree/less/tree.less
index f73d7332f..27f7123f2 100644
--- a/notebook/static/tree/less/tree.less
+++ b/notebook/static/tree/less/tree.less
@@ -167,8 +167,9 @@ ul.breadcrumb {
     margin-left: @dashboard_lr_pad;
 }
 
-.file_size{
+.file_size {
     width: 65px;
+    text-align: right;
 }
 
 [dir="rtl"] .item_modified.pull-right{