diff --git a/resources/css/ext.uls-vector.less b/resources/css/ext.uls-vector.less
index da149ecf..313c30a6 100644
--- a/resources/css/ext.uls-vector.less
+++ b/resources/css/ext.uls-vector.less
@@ -8,6 +8,8 @@
 		box-shadow: 0 2px 2px 0 rgba( 0, 0, 0, 0.25 );
 		// Not inherited from `.mw-body-content`, as we insert at `body`.
 		font-size: 0.875em;
+		// T295794 Account for Vector sticky header.
+		z-index: 3;
 	}
 
 	.uls-search {