diff --git a/modules/backend/assets/less/controls/treeview.less b/modules/backend/assets/less/controls/treeview.less
index 37ddd4724..47494ef01 100644
--- a/modules/backend/assets/less/controls/treeview.less
+++ b/modules/backend/assets/less/controls/treeview.less
@@ -197,7 +197,7 @@
             }
 
             &.dragged div, > div:hover {
-                background-color: @color-treeview-hover-bg! important;
+                background-color: @color-treeview-hover-bg !important;
 
                 > a {
                     color: @color-treeview-hover-text !important;