diff --git a/mod/assignment/backup/moodle2/backup_assignment_stepslib.php b/mod/assignment/backup/moodle2/backup_assignment_stepslib.php
index 08d49bba657..8d758873b21 100644
--- a/mod/assignment/backup/moodle2/backup_assignment_stepslib.php
+++ b/mod/assignment/backup/moodle2/backup_assignment_stepslib.php
@@ -79,7 +79,6 @@ class backup_assignment_activity_structure_step extends backup_activity_structur
         // Define file annotations
         $assignment->annotate_files('mod_assignment', 'intro', null); // This file area hasn't itemid
         $submission->annotate_files('mod_assignment', 'submission', 'id');
-        $submission->annotate_files('mod_assignment', 'online_submission', 'id'); // Until MDL-23683 gets decided/implemented
         $submission->annotate_files('mod_assignment', 'response', 'id');
 
         // Return the root element (assignment), wrapped into standard activity structure
diff --git a/mod/assignment/backup/moodle2/restore_assignment_stepslib.php b/mod/assignment/backup/moodle2/restore_assignment_stepslib.php
index ef1f3a4261b..3af067416b6 100644
--- a/mod/assignment/backup/moodle2/restore_assignment_stepslib.php
+++ b/mod/assignment/backup/moodle2/restore_assignment_stepslib.php
@@ -97,7 +97,6 @@ class restore_assignment_activity_structure_step extends restore_activity_struct
         $this->add_related_files('mod_assignment', 'intro', null);
         // Add assignment submission files, matching by assignment_submission itemname
         $this->add_related_files('mod_assignment', 'submission', 'assignment_submission');
-        $this->add_related_files('mod_assignment', 'online_submission', 'assignment_submission'); // Until MDL-23683 gets decided/implemented
         $this->add_related_files('mod_assignment', 'response', 'assignment_submission');
     }
 }