diff --git a/ryu/lib/packet/dhcp.py b/ryu/lib/packet/dhcp.py
index 7bc03e07..3b2b97b1 100644
--- a/ryu/lib/packet/dhcp.py
+++ b/ryu/lib/packet/dhcp.py
@@ -54,7 +54,6 @@ DHCP packet format
 """
 import binascii
 import random
-import socket
 import struct
 
 from . import packet_base
diff --git a/ryu/tests/unit/packet/test_dhcp.py b/ryu/tests/unit/packet/test_dhcp.py
index 84044c40..10c2330d 100644
--- a/ryu/tests/unit/packet/test_dhcp.py
+++ b/ryu/tests/unit/packet/test_dhcp.py
@@ -16,13 +16,9 @@
 
 import inspect
 import logging
-import socket
 import struct
 import unittest
-from nose.tools import *
-from nose.plugins.skip import Skip, SkipTest
-from ryu.lib import ip
-from ryu.lib import mac
+from nose.tools import eq_
 from ryu.lib import addrconv
 from ryu.lib.packet import dhcp