diff --git a/modules/ext.categoryTree.styles.css b/modules/ext.categoryTree.styles.css
index 15e2ef3d..10985813 100644
--- a/modules/ext.categoryTree.styles.css
+++ b/modules/ext.categoryTree.styles.css
@@ -24,7 +24,7 @@
  */
 
 .client-js #mw-subcategories ul {
-	list-style: none none;
+	list-style: none;
 	margin-left: 0.25em;
 }