diff --git a/pyrogram/client/types/bots/inline_keyboard_button.py b/pyrogram/client/types/bots/inline_keyboard_button.py
index 0f4779a9..ce93d96b 100644
--- a/pyrogram/client/types/bots/inline_keyboard_button.py
+++ b/pyrogram/client/types/bots/inline_keyboard_button.py
@@ -31,7 +31,7 @@ class InlineKeyboardButton(Object):
         text (``str``):
             Label text on the button.
 
-        callback_data (``str``, *optional*):
+        callback_data (``bytes``, *optional*):
             Data to be sent in a callback query to the bot when button is pressed, 1-64 bytes.
 
         url (``str``, *optional*):
@@ -85,7 +85,7 @@ class InlineKeyboardButton(Object):
         if isinstance(b, KeyboardButtonCallback):
             return InlineKeyboardButton(
                 text=b.text,
-                callback_data=b.data.decode()
+                callback_data=b.data
             )
 
         if isinstance(b, KeyboardButtonSwitchInline):