diff --git a/mod/wiki/locallib.php b/mod/wiki/locallib.php
index 6b667c47b54..7bfc79e1d29 100644
--- a/mod/wiki/locallib.php
+++ b/mod/wiki/locallib.php
@@ -1418,8 +1418,10 @@ function wiki_print_upload_table($context, $filearea, $fileitemid, $deleteupload
  */
 function wiki_build_tree($page, $node, &$keys) {
     $content = array();
-    static $icon;
-    $icon = new pix_icon('f/odt', '');
+    static $icon = null;
+    if ($icon === null) {
+        $icon = new pix_icon('f/text-24', '');
+    }
     $pages = wiki_get_linked_pages($page->id);
     foreach ($pages as $p) {
         $key = $page->id . ':' . $p->id;