diff --git a/extension.json b/extension.json
index 2eda62a0..903af81f 100644
--- a/extension.json
+++ b/extension.json
@@ -160,7 +160,8 @@
 			"scripts": "js/ext.uls.common.js",
 			"styles": "css/ext.uls.less",
 			"skinStyles": {
-				"monobook": "css/ext.uls-monobook.css"
+				"monobook": "css/ext.uls-monobook.css",
+				"vector": "css/ext.uls-vector.less"
 			},
 			"dependencies": [
 				"mediawiki.api",
diff --git a/resources/css/ext.uls-vector.less b/resources/css/ext.uls-vector.less
new file mode 100644
index 00000000..2ea05265
--- /dev/null
+++ b/resources/css/ext.uls-vector.less
@@ -0,0 +1,3 @@
+.uls-menu {
+	font-size: 0.875em; // not inherited from `.mw-body-content`, as we insert at `body`
+}