diff --git a/mod/workshop/allocation/manual/renderer.php b/mod/workshop/allocation/manual/renderer.php
index d52ea17b537..9714f9e629e 100644
--- a/mod/workshop/allocation/manual/renderer.php
+++ b/mod/workshop/allocation/manual/renderer.php
@@ -44,7 +44,7 @@ class moodle_workshopallocation_manual_renderer extends moodle_renderer_base  {
      * @return void
      */
     public function __construct($page, $output) {
-        $this->page   = $page;
+        parent::__construct($page);
         $this->output = $output;
     }
 
diff --git a/mod/workshop/renderer.php b/mod/workshop/renderer.php
index e723aed87c1..6e1f3bdf2ca 100644
--- a/mod/workshop/renderer.php
+++ b/mod/workshop/renderer.php
@@ -47,7 +47,7 @@ class moodle_mod_workshop_renderer extends moodle_renderer_base {
      * @return void
      */
     public function __construct($page, $output) {
-        $this->page   = $page;
+        parent::__construct($page);
         $this->output = $output;
     }