diff --git a/mod/quiz/classes/structure.php b/mod/quiz/classes/structure.php
index 7d2aaabdd5241..168cce519174e 100644
--- a/mod/quiz/classes/structure.php
+++ b/mod/quiz/classes/structure.php
@@ -1714,7 +1714,7 @@ public function add_random_questions(int $addonpage, int $number, array $filterc
      * @param int $slotid id of slot.
      * @return string that can be used to display the random slot.
      */
-    public function describe_random_slot($slotid) {
+    public function describe_random_slot(int $slotid): string {
         $this->ensure_random_slot_info_loaded();
 
         if (!isset($this->randomslotcategories[$slotid])) {
@@ -1738,7 +1738,7 @@ public function describe_random_slot($slotid) {
     /**
      * Ensure that {@see load_random_slot_info()} has been called, so the data is available.
      */
-    protected function ensure_random_slot_info_loaded() {
+    protected function ensure_random_slot_info_loaded(): void {
         if ($this->randomslotcategories == null) {
             $this->load_random_slot_info();
         }
@@ -1747,7 +1747,7 @@ protected function ensure_random_slot_info_loaded() {
     /**
      * Load information about the question categories and tags for all random slots,
      */
-    protected function load_random_slot_info() {
+    protected function load_random_slot_info(): void {
         global $DB;
 
         // Find the random slots.
diff --git a/mod/quiz/lang/en/quiz.php b/mod/quiz/lang/en/quiz.php
index fb1aee95300b8..6772987adef5a 100644
--- a/mod/quiz/lang/en/quiz.php
+++ b/mod/quiz/lang/en/quiz.php
@@ -850,7 +850,8 @@
 $string['randomnosubcat'] = 'Questions from this category only, not its subcategories.';
 $string['randomqname'] = 'Random question based on filter condition';
 $string['randomqnamecat'] = 'Random ({$a->category}) based on filter condition';
-$string['randomqnamecattags'] = 'Random ({$a->category}) based on filter condition with tags: {$a->tags}';$string['randomquestion'] = 'Random question';
+$string['randomqnamecattags'] = 'Random ({$a->category}) based on filter condition with tags: {$a->tags}';
+$string['randomquestion'] = 'Random question';
 $string['randomqnametags'] = 'Random question based on filter condition with tags: {$a}';
 $string['randomquestion'] = 'Random question';
 $string['randomquestion_help'] = 'A random question is a way of inserting a randomly-chosen question from a specified category or by a specified tag into an activity.';