diff --git a/admin/oacleanup.php b/admin/oacleanup.php
deleted file mode 100644
index faf55f5939a..00000000000
--- a/admin/oacleanup.php
+++ /dev/null
@@ -1,174 +0,0 @@
-<?php
-
-if (!isset($CFG)) {
-
-    require('../config.php');
-    require_once($CFG->libdir.'/adminlib.php');
-
-    admin_externalpage_setup('oacleanup');
-
-    echo $OUTPUT->header();
-    online_assignment_cleanup(true);
-    echo $OUTPUT->footer();
-
-}
-
-
-
-function online_assignment_cleanup($output=false) {
-    global $CFG, $DB, $OUTPUT;
-
-    if ($output) {
-        echo $OUTPUT->heading('Online Assignment Cleanup');
-        echo '<center>';
-    }
-
-
-    /// We don't want to run this code if we are doing an upgrade from an assignment
-    /// version earlier than 2005041400
-    /// because the assignment type field will not exist
-    $amv = $DB->get_field('modules', 'version', array('name'=>'assignment'));
-    if ((int)$amv < 2005041400) {
-        if ($output) {
-            echo '</center>';
-        }
-        return;
-    }
-
-
-    /// get the module id for assignments from db
-    $arecord = $DB->get_record('modules', array('name', 'assignment'));
-    $aid = $arecord->id;
-
-
-    /// get a list of all courses on this site
-    list($ctxselect, $ctxjoin) = context_instance_preload_sql('c.id', CONTEXT_COURSE, 'ctx');
-    $sql = "SELECT c.* $ctxselect FROM {course} c $ctxjoin";
-    $courses = $DB->get_records_sql($sql);
-
-    /// cycle through each course
-    foreach ($courses as $course) {
-        context_helper::preload_from_record($course);
-        $context = context_course::instance($course->id);
-
-        if (empty($course->fullname)) {
-            $fullname = get_string('course').': '.$course->id;
-        } else {
-            $fullname = format_string($course->fullname, true, array('context' => $context));
-        }
-        if ($output) echo $OUTPUT->heading($fullname);
-
-        /// retrieve a list of sections beyond what is currently being shown
-        $courseformatoptions = course_get_format($course)->get_format_options();
-        if (!isset($courseformatoptions['numsections'])) {
-            // Course format does not use numsections
-            if ($output) {
-                echo 'No extra sections<br />';
-            }
-            continue;
-        }
-        $sql = "SELECT *
-                  FROM {course_sections}
-                 WHERE course=? AND section>?
-              ORDER BY section ASC";
-        $params = array($course->id, $courseformatoptions['numsections']);
-        if (!($xsections = $DB->get_records_sql($sql, $params))) {
-            if ($output) echo 'No extra sections<br />';
-            continue;
-        }
-
-        /// cycle through each of the xtra sections
-        foreach ($xsections as $xsection) {
-
-            if ($output) echo 'Checking Section: '.$xsection->section.'<br />';
-
-            /// grab any module instances from the sequence field
-            if (!empty($xsection->sequence)) {
-                $instances = explode(',', $xsection->sequence);
-
-                /// cycle through the instances
-                foreach ($instances as $instance) {
-                    /// is this an instance of an online assignment
-                    $sql = "SELECT a.id
-                              FROM  {course_modules} cm, {assignment} a
-                             WHERE cm.id = ? AND cm.module = ? AND
-                                   cm.instance = a.id AND a.assignmenttype = 'online'";
-                    $params = array($instance, $aid);
-
-                    /// if record exists then we need to move instance to it's correct section
-                    if ($DB->record_exists_sql($sql, $params)) {
-
-                        /// check the new section id
-                        /// the journal update erroneously stored it in course_sections->section
-                        $newsection = $xsection->section;
-                        /// double check the new section
-                        if ($newsection > $courseformatoptions['numsections']) {
-                            /// get the record for section 0 for this course
-                            if (!($zerosection = $DB->get_record('course_sections', array('course'=>$course->id, 'section'=>'0')))) {
-                                continue;
-                            }
-                            $newsection = $zerosection->id;
-                        }
-
-                        /// grab the section record
-                        if (!($section = $DB->get_record('course_sections', array('id'=>$newsection)))) {
-                            if ($output) {
-                                echo 'Serious error: Cannot retrieve section: '.$newsection.' for course: '. $fullname .'<br />';
-                            }
-                            continue;
-                        }
-
-                        /// explode the sequence
-                        if  (($sequence = explode(',', $section->sequence)) === false) {
-                            $sequence = array();
-                        }
-
-                        /// add instance to correct section
-                        array_push($sequence, $instance);
-
-                        /// implode the sequence
-                        $section->sequence = implode(',', $sequence);
-
-                        $DB->set_field('course_sections', 'sequence', $section->sequence, array('id'=>$section->id));
-
-                        /// now we need to remove the instance from the old sequence
-
-                        /// grab the old section record
-                        if (!($section = $DB->get_record('course_sections', array('id'=>$xsection->id)))) {
-                            if ($output) echo 'Serious error: Cannot retrieve old section: '.$xsection->id.' for course: '.$fullname.'<br />';
-                            continue;
-                        }
-
-                        /// explode the sequence
-                        if  (($sequence = explode(',', $section->sequence)) === false) {
-                            $sequence = array();
-                        }
-
-                        /// remove the old value from the array
-                        $key = array_search($instance, $sequence);
-                        unset($sequence[$key]);
-
-                        /// implode the sequence
-                        $section->sequence = implode(',', $sequence);
-
-                        $DB->set_field('course_sections', 'sequence', $section->sequence, array('id'=>$section->id));
-
-
-                        if ($output) echo 'Online Assignment (instance '.$instance.') moved from section '.$section->id.': to section '.$newsection.'<br />';
-
-                    }
-                }
-            }
-
-            /// if the summary and sequence are empty then remove this section
-            if (empty($xsection->summary) and empty($xsection->sequence)) {
-                $DB->delete_records('course_sections', array('id'=>$xsection->id));
-                if ($output) echo 'Deleting empty section '.$xsection->section.'<br />';
-            }
-        }
-    }
-
-    echo '</center>';
-}
-
-
diff --git a/lib/upgradelib.php b/lib/upgradelib.php
index 99d254d820a..e2b5aa34704 100644
--- a/lib/upgradelib.php
+++ b/lib/upgradelib.php
@@ -337,6 +337,8 @@ function upgrade_stale_php_files_present() {
     global $CFG;
 
     $someexamplesofremovedfiles = array(
+        // removed in 2.6dev
+        '/admin/oacleanup.php',
         // removed in 2.5dev
         '/backup/lib.php',
         '/backup/bb/README.txt',