diff --git a/pyrogram/methods/chats/unpin_all_chat_messages.py b/pyrogram/methods/chats/unpin_all_chat_messages.py
index fe34bb14..ad0b0b7d 100644
--- a/pyrogram/methods/chats/unpin_all_chat_messages.py
+++ b/pyrogram/methods/chats/unpin_all_chat_messages.py
@@ -27,6 +27,7 @@ class UnpinAllChatMessages:
     async def unpin_all_chat_messages(
         self: "pyrogram.Client",
         chat_id: Union[int, str],
+        message_thread_id: int = None,
     ) -> bool:
         """Use this method to clear the list of pinned messages in a chat.
         If the chat is not a private chat, the bot must be an administrator in the chat for this to work and must have
@@ -39,6 +40,9 @@ class UnpinAllChatMessages:
                 Unique identifier (int) or username (str) of the target chat.
                 You can also use chat public link in form of *t.me/<username>* (str).
 
+            message_thread_id (``int``, *optional*):
+                Unique identifier for the target message thread of the forum topic
+
         Returns:
             ``bool``: True on success.
 
@@ -48,10 +52,10 @@ class UnpinAllChatMessages:
                 # Unpin all chat messages
                 await app.unpin_all_chat_messages(chat_id)
         """
-        await self.invoke(
+        r = await self.invoke(
             raw.functions.messages.UnpinAllMessages(
-                peer=await self.resolve_peer(chat_id)
+                peer=await self.resolve_peer(chat_id),
+                top_msg_id=message_thread_id
             )
         )
-
-        return True
+        return r.pts_count