diff --git a/ltix/classes/helper.php b/ltix/classes/helper.php
index a42b9cd1e8c45..8d550fa3cc305 100644
--- a/ltix/classes/helper.php
+++ b/ltix/classes/helper.php
@@ -406,7 +406,7 @@ public static function tool_configuration_from_content_item($typeid, $messagetyp
      *
      * @return stdClass Form config for the item
      */
-    public static function content_item_to_form(object $tool, object $typeconfig, object $item) : stdClass {
+    public static function content_item_to_form(object $tool, object $typeconfig, object $item): stdClass {
         global $OUTPUT;
 
         $config = new stdClass();
@@ -1598,7 +1598,7 @@ public static function update_config($config) {
      * @param string $lticoursecategories Comma separated list of course categories.
      * @return void
      */
-    public static function type_add_categories(int $typeid, string $lticoursecategories = '') : void {
+    public static function type_add_categories(int $typeid, string $lticoursecategories = ''): void {
         global $DB;
         $coursecategories = explode(',', $lticoursecategories);
         foreach ($coursecategories as $coursecategory) {
@@ -2087,7 +2087,7 @@ public static function load_type_if_cartridge($type) {
      * @param  object $instance the external tool activity settings
      * @return object|null
      */
-    public static function get_instance_type(object $instance) : ?object {
+    public static function get_instance_type(object $instance): ?object {
         if (empty($instance->typeid)) {
             if (!$tool = self::get_tool_by_url_match($instance->toolurl, $instance->course)) {
                 $tool = self::get_tool_by_url_match($instance->securetoolurl,  $instance->course);
diff --git a/ltix/classes/local/ltiopenid/registration_helper.php b/ltix/classes/local/ltiopenid/registration_helper.php
index ae2fad8eb3ea0..6a2dc467865ce 100644
--- a/ltix/classes/local/ltiopenid/registration_helper.php
+++ b/ltix/classes/local/ltiopenid/registration_helper.php
@@ -277,11 +277,11 @@ private function add_previous_key_claim(array &$lticonfig, string $key, string $
      *
      * @param object $config Moodle LTI Config.
      * @param int $typeid which is the LTI deployment id.
-     * @param object $type tool instance in case the tool already exists.
+     * @param object|null $type tool instance in case the tool already exists.
      *
      * @return array the Client Registration as an associative array.
      */
-    public function config_to_registration(object $config, int $typeid, object $type = null): array {
+    public function config_to_registration(object $config, int $typeid, ?object $type = null): array {
         $configarray = [];
         foreach ((array)$config as $k => $v) {
             if (substr($k, 0, 4) == 'lti_') {
@@ -443,7 +443,7 @@ public function sign(string $key, string $salt, string $secret): string {
      *
      * @return mixed Tool Proxy details
      */
-    public function get_tool_proxy(int $proxyid) : array {
+    public function get_tool_proxy(int $proxyid): array {
         return helper::get_tool_proxy($proxyid);
     }
 }
diff --git a/ltix/classes/local/ltiservice/resource_base.php b/ltix/classes/local/ltiservice/resource_base.php
index 836ed2d8c3028..ef7618625e291 100644
--- a/ltix/classes/local/ltiservice/resource_base.php
+++ b/ltix/classes/local/ltiservice/resource_base.php
@@ -201,7 +201,7 @@ public function get_endpoint() {
      *
      * @param response $response  Response object for this request.
      */
-    public abstract function execute($response);
+    abstract public function execute($response);
 
     /**
      * Check to make sure the request is valid.