diff --git a/src/Umbraco.Web.UI.Client/src/less/components/tree/umb-tree-item.less b/src/Umbraco.Web.UI.Client/src/less/components/tree/umb-tree-item.less
index d6202c5665..097665bdd4 100644
--- a/src/Umbraco.Web.UI.Client/src/less/components/tree/umb-tree-item.less
+++ b/src/Umbraco.Web.UI.Client/src/less/components/tree/umb-tree-item.less
@@ -28,7 +28,7 @@
         overflow: hidden;
         position: absolute;
         left: 0;
-        bottom: -1;
+        bottom: -1px;
 
         div { 
             .umb-loader;