diff --git a/include/conversation.php b/include/conversation.php
index ce937a7a71..6dd1a473ec 100644
--- a/include/conversation.php
+++ b/include/conversation.php
@@ -10,7 +10,7 @@ use Friendica\Core\System;
 use Friendica\Database\DBM;
 use Friendica\Model\Contact;
 use Friendica\Object\Thread;
-use Friendica\Object\Item;
+use Friendica\Object\Post;
 
 require_once "include/bbcode.php";
 require_once "include/acl_selectors.php";
@@ -880,7 +880,7 @@ function conversation(App $a, $items, $mode, $update, $preview = false) {
 				$item['pagedrop'] = $page_dropping;
 
 				if ($item['id'] == $item['parent']) {
-					$item_object = new Item($item);
+					$item_object = new Post($item);
 					$conv->addParent($item_object);
 				}
 			}
diff --git a/src/Object/Post.php b/src/Object/Post.php
index 231f2a5b84..8d56034a5e 100644
--- a/src/Object/Post.php
+++ b/src/Object/Post.php
@@ -45,7 +45,7 @@ class Post extends BaseObject
 	 *
 	 * @param array $data data array
 	 */
-	public function __construct($data)
+	public function __construct(array $data)
 	{
 		$a = self::getApp();
 
diff --git a/src/Object/Thread.php b/src/Object/Thread.php
index 2a72f0f659..d159f41c96 100644
--- a/src/Object/Thread.php
+++ b/src/Object/Thread.php
@@ -5,7 +5,7 @@
 namespace Friendica\Object;
 
 use Friendica\BaseObject;
-use Friendica\Object\Item;
+use Friendica\Object\Post;
 
 require_once 'boot.php';
 require_once 'include/text.php';
@@ -120,7 +120,7 @@ class Thread extends BaseObject
 	 * @return mixed The inserted item on success
 	 *               false on failure
 	 */
-	public function addParent($item)
+	public function addParent(Post $item)
 	{
 		$item_id = $item->getId();