diff --git a/grade/report/singleview/classes/local/ui/dropdown_attribute.php b/grade/report/singleview/classes/local/ui/dropdown_attribute.php
index af70f02b4c0..921ba92434c 100644
--- a/grade/report/singleview/classes/local/ui/dropdown_attribute.php
+++ b/grade/report/singleview/classes/local/ui/dropdown_attribute.php
@@ -24,6 +24,8 @@
 
 namespace gradereport_singleview\local\ui;
 
+use html_writer;
+
 defined('MOODLE_INTERNAL') || die;
 
 /**