diff --git a/mod/assign/feedback/editpdf/tests/editpdf_test.php b/mod/assign/feedback/editpdf/tests/editpdf_test.php
index 207a64bd299..6afe93ffa8b 100644
--- a/mod/assign/feedback/editpdf/tests/editpdf_test.php
+++ b/mod/assign/feedback/editpdf/tests/editpdf_test.php
@@ -52,13 +52,6 @@ class assignfeedback_editpdf_testcase extends mod_assign_base_testcase {
         parent::setUp();
     }
 
-    /**
-     * Tidy up open files that may be left open.
-     */
-    protected function tearDown() {
-        gc_collect_cycles();
-    }
-
     protected function create_assign_and_submit_pdf() {
         global $CFG;
         $assign = $this->create_instance(array('assignsubmission_onlinetext_enabled' => 1,