diff --git a/filter/activitynames/db/install.php b/filter/activitynames/db/install.php
index ea065a5616c..cc0a7942fc4 100644
--- a/filter/activitynames/db/install.php
+++ b/filter/activitynames/db/install.php
@@ -26,6 +26,6 @@ function xmldb_filter_activitynames_install() {
     global $CFG;
     require_once("$CFG->libdir/filterlib.php");
 
-    filter_set_global_state('activitynames', TEXTFILTER_ON);
+    filter_set_global_state('activitynames', TEXTFILTER_ON, 1);
 }
 
diff --git a/filter/mathjaxloader/db/install.php b/filter/mathjaxloader/db/install.php
new file mode 100644
index 00000000000..8a9724b6141
--- /dev/null
+++ b/filter/mathjaxloader/db/install.php
@@ -0,0 +1,33 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Mathjax filter post install hook
+ *
+ * @package    filter
+ * @subpackage mathjaxloader
+ * @copyright  2014 onwards Andrew Davis (andyjdavis)
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+defined('MOODLE_INTERNAL') || die();
+
+function xmldb_filter_mathjaxloader_install() {
+    global $CFG;
+    require_once("$CFG->libdir/filterlib.php");
+
+    filter_set_global_state('mathjaxloader', TEXTFILTER_ON, -1);
+}
diff --git a/lib/filterlib.php b/lib/filterlib.php
index 0f6072c1dfd..5aca116f7ab 100644
--- a/lib/filterlib.php
+++ b/lib/filterlib.php
@@ -527,7 +527,7 @@ function filter_get_all_installed() {
  *
  * @param string $filtername The filter name, for example 'tex'.
  * @param int $state One of the values TEXTFILTER_ON, TEXTFILTER_OFF or TEXTFILTER_DISABLED.
- * @param int $move 1 means up, 0 means the same, -1 means down
+ * @param int $move -1 means up, 0 means the same, 1 means down
  */
 function filter_set_global_state($filtername, $state, $move = 0) {
     global $DB;