diff --git a/typo3/sysext/backend/Classes/View/BackendLayout/BackendLayout.php b/typo3/sysext/backend/Classes/View/BackendLayout/BackendLayout.php
index cc85112ac211ad57aedaf4505b28a0a59df655cd..244c8ed1679ff455d2694a46ef41cca43fb2b2f1 100644
--- a/typo3/sysext/backend/Classes/View/BackendLayout/BackendLayout.php
+++ b/typo3/sysext/backend/Classes/View/BackendLayout/BackendLayout.php
@@ -1,7 +1,5 @@
 <?php
 
-declare(strict_types=1);
-
 /*
  * This file is part of the TYPO3 CMS project.
  *
@@ -22,6 +20,9 @@ use TYPO3\CMS\Core\Utility\GeneralUtility;
 
 /**
  * Class to represent a backend layout.
+ *
+ * # @deprecated: put the following line in TYPO3 v14.0, see #104099 and #103365
+ * # declare(strict_types=1);
  */
 class BackendLayout
 {