diff --git a/mod/quiz/report/grading/report.php b/mod/quiz/report/grading/report.php
index 6d20d2a055f..9d31f04b5ca 100644
--- a/mod/quiz/report/grading/report.php
+++ b/mod/quiz/report/grading/report.php
@@ -484,7 +484,6 @@ class quiz_grading_report extends quiz_default_report {
         $transaction = $DB->start_delegated_transaction();
         foreach ($qubaids as $qubaid) {
             $attempt = $attempts[$qubaid];
-            $quba = question_engine::load_questions_usage_by_activity($qubaid);
             $attemptobj = new quiz_attempt($attempt, $this->quiz, $this->cm, $this->course);
             $attemptobj->process_submitted_actions(time());
         }