diff --git a/grade/edit/letter/index.php b/grade/edit/letter/index.php
index 393afe4c96905..dedd4bf2462b5 100644
--- a/grade/edit/letter/index.php
+++ b/grade/edit/letter/index.php
@@ -141,7 +141,7 @@
         if (!$admin and empty($data->override)) {
             $records = $DB->get_records('grade_letters', array('contextid' => $context->id));
             foreach ($records as $record) {
-                $DB->delete_record('grade_letters', array('id' => $record->id));
+                $DB->delete_records('grade_letters', array('id' => $record->id));
                 // Trigger the letter grade deleted event.
                 $event = \core\event\grade_letter_deleted::create(array(
                     'objectid' => $record->id,