diff --git a/badges/renderer.php b/badges/renderer.php
index d78c54b31026c..6c7dc92951de2 100644
--- a/badges/renderer.php
+++ b/badges/renderer.php
@@ -231,6 +231,7 @@ public function print_badge_table_actions($badge, $context) {
             if ($badge->status == BADGE_STATUS_INACTIVE || $badge->status == BADGE_STATUS_INACTIVE_LOCKED) {
                 $url = new moodle_url(qualified_me());
                 $url->param('activate', $badge->id);
+                $url->param('sesskey', sesskey());
                 $actions .= $this->output->action_icon($url, new pix_icon('t/show', get_string('activate', 'badges'))) . " ";
             } else {
                 $url = new moodle_url(qualified_me());