diff --git a/mod/quiz/attemptlib.php b/mod/quiz/attemptlib.php
index 5060db3472d..22819860871 100644
--- a/mod/quiz/attemptlib.php
+++ b/mod/quiz/attemptlib.php
@@ -1975,23 +1975,6 @@ class quiz_attempt {
         $event->trigger();
     }
 
-    /**
-     * Print the fields of the comment form for questions in this attempt.
-     * @param $slot which question to output the fields for.
-     * @param $prefix Prefix to add to all field names.
-     */
-    public function question_print_comment_fields($slot, $prefix) {
-        // Work out a nice title.
-        $student = get_record('user', 'id', $this->get_userid());
-        $a = new object();
-        $a->fullname = fullname($student, true);
-        $a->attempt = $this->get_attempt_number();
-
-        question_print_comment_fields($this->quba->get_question_attempt($slot),
-                $prefix, $this->get_display_options(true)->markdp,
-                get_string('gradingattempt', 'quiz_grading', $a));
-    }
-
     // Private methods =========================================================
 
     /**
diff --git a/mod/quiz/upgrade.txt b/mod/quiz/upgrade.txt
index 2c395e86287..78bee87a9d0 100644
--- a/mod/quiz/upgrade.txt
+++ b/mod/quiz/upgrade.txt
@@ -1,5 +1,9 @@
 This files describes API changes in the quiz code.
 
+=== 3.1 ===
+* quiz_attempt::question_print_comment_fields() has been removed. It was broken
+  since at least Moodle 2.0.
+
 === 2.9 ===
 
 * There have been changes in classes/output/edit_renderer.php for MDL-40990.