diff --git a/admin/tool/usertours/classes/helper.php b/admin/tool/usertours/classes/helper.php
index ee0eb52d766..da8a9410dfb 100644
--- a/admin/tool/usertours/classes/helper.php
+++ b/admin/tool/usertours/classes/helper.php
@@ -44,6 +44,11 @@ class helper {
      */
     const MOVE_DOWN = 1;
 
+    /**
+     * @var boolean Has it been bootstrapped?
+     */
+    private static $bootstrapped = false;
+
     /**
      * Get the link to edit the step.
      *
@@ -488,6 +493,11 @@ class helper {
     public static function bootstrap() {
         global $PAGE;
 
+        if (self::$bootstrapped) {
+            return;
+        }
+        self::$bootstrapped = true;
+
         if ($tour = manager::get_current_tour()) {
             $PAGE->requires->js_call_amd('tool_usertours/usertours', 'init', [
                     $tour->get_id(),
diff --git a/admin/tool/usertours/lib.php b/admin/tool/usertours/lib.php
index 476dd093847..086fdb41619 100644
--- a/admin/tool/usertours/lib.php
+++ b/admin/tool/usertours/lib.php
@@ -67,3 +67,11 @@ function tool_usertours_inplace_editable($itemtype, $itemid, $newvalue) {
 function tool_usertours_extend_navigation_user() {
     \tool_usertours\helper::bootstrap();
 }
+
+/**
+ * Add JS to bootstrap tours. Only in Moodle 3.3+
+ */
+function tool_usertours_before_footer() {
+    \tool_usertours\helper::bootstrap();
+}
+