diff --git a/mod/assign/locallib.php b/mod/assign/locallib.php
index 52f9ef9c604..aad3f96e1ff 100644
--- a/mod/assign/locallib.php
+++ b/mod/assign/locallib.php
@@ -514,7 +514,7 @@ class assign {
         }
 
         $returnparams = array('rownum'=>optional_param('rownum', 0, PARAM_INT),
-                              'useridlistid'=>optional_param('useridlistid', 0, PARAM_INT));
+                              'useridlistid' => optional_param('useridlistid', time(), PARAM_INT));
         $this->register_return_link($action, $returnparams);
 
         // Now show the right view page.
diff --git a/mod/assign/view.php b/mod/assign/view.php
index 62e0b7f16cf..0bcae0c23cd 100644
--- a/mod/assign/view.php
+++ b/mod/assign/view.php
@@ -30,7 +30,7 @@ $id = required_param('id', PARAM_INT);
 $urlparams = array('id' => $id,
                   'action' => optional_param('action', '', PARAM_TEXT),
                   'rownum' => optional_param('rownum', 0, PARAM_INT),
-                  'useridlistid' => optional_param('action', 0, PARAM_INT));
+                  'useridlistid' => optional_param('useridlistid', time(), PARAM_INT));
 
 $url = new moodle_url('/mod/assign/view.php', $urlparams);