diff --git a/resources/css/ext.uls-vector.less b/resources/css/ext.uls-vector.less
index eeb7a52f..42e1cd42 100644
--- a/resources/css/ext.uls-vector.less
+++ b/resources/css/ext.uls-vector.less
@@ -11,7 +11,7 @@
 		// Not inherited from `.mw-body-content`, as we insert at `body`.
 		font-size: 0.875em;
 		// T295794 Account for Vector sticky header.
-		z-index: 3;
+		z-index: @z-index-dropdown;
 	}
 
 	.uls-search {