diff --git a/hbmqtt/mqtt/connack.py b/hbmqtt/mqtt/connack.py
index a54ec94..467170c 100644
--- a/hbmqtt/mqtt/connack.py
+++ b/hbmqtt/mqtt/connack.py
@@ -50,7 +50,7 @@ class ConnackPacket(MQTTPacket):
     VARIABLE_HEADER = ConnackVariableHeader
     PAYLOAD = None
 
-    def __init__(self, fixed: MQTTFixedHeader, variable_header: ConnackVariableHeader=None, payload: MQTTPayload=None):
+    def __init__(self, fixed: MQTTFixedHeader, variable_header: ConnackVariableHeader=None):
         if fixed is None:
             header = MQTTFixedHeader(PacketType.CONNACK, 0x00)
         else:
diff --git a/hbmqtt/mqtt/connect.py b/hbmqtt/mqtt/connect.py
index e8cf959..5fee303 100644
--- a/hbmqtt/mqtt/connect.py
+++ b/hbmqtt/mqtt/connect.py
@@ -1,7 +1,6 @@
 # Copyright (c) 2015 Nicolas JOUANIN
 #
 # See the file license.txt for copying permission.
-import asyncio
 from hbmqtt.mqtt.packet import MQTTPacket, MQTTFixedHeader, PacketType, MQTTVariableHeader, MQTTPayload
 from hbmqtt.codecs import *
 from hbmqtt.errors import MQTTException, CodecException, HBMQTTException, NoDataException
diff --git a/hbmqtt/mqtt/disconnect.py b/hbmqtt/mqtt/disconnect.py
index 5e35365..32fd4fe 100644
--- a/hbmqtt/mqtt/disconnect.py
+++ b/hbmqtt/mqtt/disconnect.py
@@ -1,9 +1,7 @@
 # Copyright (c) 2015 Nicolas JOUANIN
 #
 # See the file license.txt for copying permission.
-import asyncio
 from hbmqtt.mqtt.packet import MQTTPacket, MQTTFixedHeader, PacketType, MQTTVariableHeader, MQTTPayload
-from hbmqtt.codecs import int_to_bytes, read_or_raise, bytes_to_int
 from hbmqtt.errors import HBMQTTException
 
 class DisconnectPacket(MQTTPacket):