diff --git a/Neos.Flow/Classes/Session/Data/SessionIdentifier.php b/Neos.Flow/Classes/Session/Data/SessionIdentifier.php
index 0545ad460d..919562596b 100644
--- a/Neos.Flow/Classes/Session/Data/SessionIdentifier.php
+++ b/Neos.Flow/Classes/Session/Data/SessionIdentifier.php
@@ -23,7 +23,7 @@
 class SessionIdentifier
 {
     private function __construct(
-        public /*readonly*/ $value
+        public readonly string $value
     ) {
     }
 
diff --git a/Neos.Flow/Classes/Session/Data/SessionMetaData.php b/Neos.Flow/Classes/Session/Data/SessionMetaData.php
index ebbebc7d4b..2ca5403d01 100644
--- a/Neos.Flow/Classes/Session/Data/SessionMetaData.php
+++ b/Neos.Flow/Classes/Session/Data/SessionMetaData.php
@@ -27,10 +27,10 @@ class SessionMetaData
      * @param string[] $tags
      */
     public function __construct(
-        public /** readonly */ SessionIdentifier $sessionIdentifier,
-        public /** readonly */ StorageIdentifier $storageIdentifier,
-        public /** readonly */ int $lastActivityTimestamp,
-        public /** readonly */ array $tags
+        public readonly SessionIdentifier $sessionIdentifier,
+        public readonly StorageIdentifier $storageIdentifier,
+        public readonly int $lastActivityTimestamp,
+        public readonly array $tags
     ) {
     }
 
diff --git a/Neos.Flow/Classes/Session/Data/StorageIdentifier.php b/Neos.Flow/Classes/Session/Data/StorageIdentifier.php
index 580a40d4fb..fb3a769509 100644
--- a/Neos.Flow/Classes/Session/Data/StorageIdentifier.php
+++ b/Neos.Flow/Classes/Session/Data/StorageIdentifier.php
@@ -23,7 +23,7 @@
 class StorageIdentifier
 {
     private function __construct(
-        public /*readonly*/ $value
+        public readonly string $value
     ) {
     }