diff --git a/src/Umbraco.Web.UI.Client/src/less/tree.less b/src/Umbraco.Web.UI.Client/src/less/tree.less
index 4e2e3e77e8..013b60ce19 100644
--- a/src/Umbraco.Web.UI.Client/src/less/tree.less
+++ b/src/Umbraco.Web.UI.Client/src/less/tree.less
@@ -40,7 +40,7 @@
 .umb-tree li.current > div i.icon,
 .umb-tree li.current > div ins {
 	color: white !important;
-	background: @blue;
+	background-color: @blue;
 	border-color: @blue;
 }
 .umb-tree li.root > div {