diff --git a/mod/lesson/action/addcluster.php b/mod/lesson/action/addcluster.php
index baf5aa0b6ad..fd9ac3e35fe 100644
--- a/mod/lesson/action/addcluster.php
+++ b/mod/lesson/action/addcluster.php
@@ -6,7 +6,7 @@
  * @license http://www.gnu.org/copyleft/gpl.html GNU Public License
  * @package lesson
  **/
-    confirm_sesskey();
+    require_sesskey();
 
     // first get the preceeding page
     // if $pageid = 0, then we are inserting a new page at the beginning of the lesson
diff --git a/mod/lesson/action/addendofbranch.php b/mod/lesson/action/addendofbranch.php
index 5decb9f2f9f..4e6e6872b09 100644
--- a/mod/lesson/action/addendofbranch.php
+++ b/mod/lesson/action/addendofbranch.php
@@ -6,7 +6,7 @@
  * @license http://www.gnu.org/copyleft/gpl.html GNU Public License
  * @package lesson
  **/
-    confirm_sesskey();
+    require_sesskey();
 
     // first get the preceeding page
     $pageid = required_param('pageid', PARAM_INT);
diff --git a/mod/lesson/action/addendofcluster.php b/mod/lesson/action/addendofcluster.php
index be1d261d9ff..8b754f847a9 100644
--- a/mod/lesson/action/addendofcluster.php
+++ b/mod/lesson/action/addendofcluster.php
@@ -6,7 +6,7 @@
  * @license http://www.gnu.org/copyleft/gpl.html GNU Public License
  * @package lesson
  **/
-    confirm_sesskey();
+    require_sesskey();
 
     // first get the preceeding page
     $pageid = required_param('pageid', PARAM_INT);
diff --git a/mod/lesson/action/confirmdelete.php b/mod/lesson/action/confirmdelete.php
index 586312a6326..9d9567882ba 100644
--- a/mod/lesson/action/confirmdelete.php
+++ b/mod/lesson/action/confirmdelete.php
@@ -6,7 +6,7 @@
  * @license http://www.gnu.org/copyleft/gpl.html GNU Public License
  * @package lesson
  **/
-    confirm_sesskey();
+    require_sesskey();
 
     $pageid = required_param('pageid', PARAM_INT);
     if (!$thispage = get_record("lesson_pages", "id", $pageid)) {
diff --git a/mod/lesson/action/continue.php b/mod/lesson/action/continue.php
index db001af757e..272365815ec 100644
--- a/mod/lesson/action/continue.php
+++ b/mod/lesson/action/continue.php
@@ -6,7 +6,7 @@
  * @license http://www.gnu.org/copyleft/gpl.html GNU Public License
  * @package lesson
  **/
-    confirm_sesskey();
+    require_sesskey();
 
     require_once($CFG->dirroot.'/mod/lesson/pagelib.php');
     require_once($CFG->libdir.'/blocklib.php');
diff --git a/mod/lesson/action/delete.php b/mod/lesson/action/delete.php
index 9be1272a12b..2abb4bc1bf4 100644
--- a/mod/lesson/action/delete.php
+++ b/mod/lesson/action/delete.php
@@ -6,7 +6,7 @@
  * @license http://www.gnu.org/copyleft/gpl.html GNU Public License
  * @package lesson
  **/
-    confirm_sesskey();
+    require_sesskey();
 
     $pageid = required_param('pageid', PARAM_INT);
     if (!$thispage = get_record("lesson_pages", "id", $pageid)) {
diff --git a/mod/lesson/action/insertpage.php b/mod/lesson/action/insertpage.php
index e4217dd73e0..173466b6139 100644
--- a/mod/lesson/action/insertpage.php
+++ b/mod/lesson/action/insertpage.php
@@ -6,7 +6,7 @@
  * @license http://www.gnu.org/copyleft/gpl.html GNU Public License
  * @package lesson
  **/
-    confirm_sesskey();
+    require_sesskey();
 
     // check to see if the cancel button was pushed
     if (optional_param('cancel', '', PARAM_ALPHA)) {
diff --git a/mod/lesson/action/moveit.php b/mod/lesson/action/moveit.php
index 2e2d0959165..c8233bdba17 100644
--- a/mod/lesson/action/moveit.php
+++ b/mod/lesson/action/moveit.php
@@ -6,7 +6,7 @@
  * @license http://www.gnu.org/copyleft/gpl.html GNU Public License
  * @package lesson
  **/
-    confirm_sesskey();
+    require_sesskey();
 
     $pageid = required_param('pageid', PARAM_INT); //  page to move
     if (!$page = get_record("lesson_pages", "id", $pageid)) {
diff --git a/mod/lesson/action/updatepage.php b/mod/lesson/action/updatepage.php
index 251a8adb558..2d46254e383 100644
--- a/mod/lesson/action/updatepage.php
+++ b/mod/lesson/action/updatepage.php
@@ -6,7 +6,7 @@
  * @license http://www.gnu.org/copyleft/gpl.html GNU Public License
  * @package lesson
  **/
-    confirm_sesskey();
+    require_sesskey();
     
     $redirect = optional_param('redirect', '', PARAM_ALPHA);
 
diff --git a/mod/lesson/essay.php b/mod/lesson/essay.php
index bdccd0653fc..9d047fd7ee0 100644
--- a/mod/lesson/essay.php
+++ b/mod/lesson/essay.php
@@ -60,7 +60,7 @@
             }
             break;
         case 'grade':  // Grading form - get the necessary data
-            confirm_sesskey();
+            require_sesskey();
             
             $attemptid = required_param('attemptid', PARAM_INT);
 
@@ -136,7 +136,7 @@
             }
             break;
         case 'email': // Sending an email(s) to a single user or all
-            confirm_sesskey();
+            require_sesskey();
             
             // Get our users (could be singular)
             if ($userid = optional_param('userid', 0, PARAM_INT)) {