diff --git a/mod/assignment/type/online/assignment.class.php b/mod/assignment/type/online/assignment.class.php
index 6adf048044f..be5a238ca28 100644
--- a/mod/assignment/type/online/assignment.class.php
+++ b/mod/assignment/type/online/assignment.class.php
@@ -375,7 +375,7 @@ class assignment_online extends assignment_base {
         }
     }
 
-    public function send_file($filearea, $args, $forcedownload, $options) {
+    public function send_file($filearea, $args, $forcedownload, array $options=array()) {
         global $USER;
         require_capability('mod/assignment:view', $this->context);
 
diff --git a/mod/assignment/type/upload/assignment.class.php b/mod/assignment/type/upload/assignment.class.php
index f4fee1d2cfc..54c4b716c6a 100644
--- a/mod/assignment/type/upload/assignment.class.php
+++ b/mod/assignment/type/upload/assignment.class.php
@@ -614,7 +614,7 @@ class assignment_upload extends assignment_base {
         die;
     }
 
-    function send_file($filearea, $args, $forcedownload, $options) {
+    function send_file($filearea, $args, $forcedownload, array $options=array()) {
         global $CFG, $DB, $USER;
         require_once($CFG->libdir.'/filelib.php');
 
diff --git a/mod/assignment/type/uploadsingle/assignment.class.php b/mod/assignment/type/uploadsingle/assignment.class.php
index b7b3071a4da..39b41b7917b 100644
--- a/mod/assignment/type/uploadsingle/assignment.class.php
+++ b/mod/assignment/type/uploadsingle/assignment.class.php
@@ -300,7 +300,7 @@ class assignment_uploadsingle extends assignment_base {
         return true;
     }
 
-    function send_file($filearea, $args, $forcedownload, $options) {
+    function send_file($filearea, $args, $forcedownload, array $options=array()) {
         global $CFG, $DB, $USER;
         require_once($CFG->libdir.'/filelib.php');