diff --git a/reportbuilder/classes/local/entities/base.php b/reportbuilder/classes/local/entities/base.php
index 3ec24ba2812..5b8d4444ba7 100644
--- a/reportbuilder/classes/local/entities/base.php
+++ b/reportbuilder/classes/local/entities/base.php
@@ -67,8 +67,9 @@ abstract class base {
      * @deprecated since Moodle 4.4 - aliases are now autogenerated, please implement {@see get_default_tables} instead
      */
     #[\core\attribute\deprecated('::get_default_tables', since: '4.4', mdl: 'MDL-79397', final: true)]
-    protected function get_default_table_aliases(): void {
+    protected function get_default_table_aliases(): array {
         \core\deprecation::emit_deprecation_if_present([self::class, __FUNCTION__]);
+        return [];
     }
 
     /**