diff --git a/mod/forum/report.php b/mod/forum/report.php
index 8a2b294ad89..d3405480a8c 100644
--- a/mod/forum/report.php
+++ b/mod/forum/report.php
@@ -81,6 +81,6 @@
         echo "<br />";
     }
 
-    close_window_button();
+    echo $OUTPUT->close_window_button();
     print_footer('none');
 ?>