diff --git a/maxapi/types/attachments/buttons/chat_button.py b/maxapi/types/attachments/buttons/chat_button.py
index a0ea681..a4ec8d5 100644
--- a/maxapi/types/attachments/buttons/chat_button.py
+++ b/maxapi/types/attachments/buttons/chat_button.py
@@ -17,7 +17,7 @@ class ChatButton(Button):
     """
     
     type: ButtonType = ButtonType.CHAT
-    chat_title: Optional[str] = None
+    chat_title: str
     chat_description: Optional[str] = None
     start_payload: Optional[str] = None
     uuid: Optional[int] = None 
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