diff --git a/mod/forum/mod.html b/mod/forum/mod.html
index abd97a8487c..12b3952a7ae 100644
--- a/mod/forum/mod.html
+++ b/mod/forum/mod.html
@@ -52,7 +52,7 @@
     <td>
     <?php
        $student = strtolower($course->student);
-       require("$CFG->dirroot/mod/forum/lib.php");
+       require_once("$CFG->dirroot/mod/forum/lib.php");
        asort($FORUM_TYPES);
        if (! $form->type) {
            $form->type = 'general';