diff --git a/mod/forum/view.php b/mod/forum/view.php
index acbda42895e..2283ad4a3cd 100644
--- a/mod/forum/view.php
+++ b/mod/forum/view.php
@@ -156,9 +156,10 @@
     }
 
     if (!empty($forum->blockafter) && !empty($forum->blockperiod)) {
+        $a = new stdClass();
         $a->blockafter = $forum->blockafter;
         $a->blockperiod = get_string('secondstotime'.$forum->blockperiod);
-        echo $OUTPUT->notification(get_string('thisforumisthrottled','forum',$a));
+        echo $OUTPUT->notification(get_string('thisforumisthrottled', 'forum', $a));
     }
 
     if ($forum->type == 'qanda' && !has_capability('moodle/course:manageactivities', $context)) {