diff --git a/admin/tool/lpimportcsv/index.php b/admin/tool/lpimportcsv/index.php
index fe14dac470b..2c541d378a7 100644
--- a/admin/tool/lpimportcsv/index.php
+++ b/admin/tool/lpimportcsv/index.php
@@ -21,7 +21,7 @@
  * @copyright  2016 Damyon Wiese
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
-
+define('NO_OUTPUT_BUFFERING', true);
 require_once(__DIR__ . '/../../../config.php');
 require_once($CFG->libdir.'/adminlib.php');