diff --git a/typo3/sysext/backend/Classes/Utility/BackendUtility.php b/typo3/sysext/backend/Classes/Utility/BackendUtility.php
index f6989de8c48ebd50f0ad11a6e860bae88d145276..4b5e3274b10f3cc4364e264072a8ce94c4e28f84 100644
--- a/typo3/sysext/backend/Classes/Utility/BackendUtility.php
+++ b/typo3/sysext/backend/Classes/Utility/BackendUtility.php
@@ -1127,7 +1127,7 @@ class BackendUtility
      * @param bool $preferNavTitle Prefers the 'nav_title' if available over the 'title' (nessesary for Tree with options.pageTree.showNavTitle = 1)
      * @return string
      */
-    public static function titleAttribForPages($row, $perms_clause = '', $includeAttrib = true, $preferNavTitle = false)
+    public static function titleAttribForPages($row, $perms_clause = '', $includeAttrib = true, bool $preferNavTitle = false)
     {
         if (!isset($row['uid'])) {
             return '';