diff --git a/configuration.py b/configuration.py
index 240c2aa..ac0550b 100644
--- a/configuration.py
+++ b/configuration.py
@@ -1,9 +1,7 @@
 # This file is part product_purchase_sequence module for Tryton.
 # The COPYRIGHT file at the top level of this repository contains
 # the full copyright notices and license terms.
-from trytond.model import ModelView, ModelSQL, ModelSingleton, fields
-from trytond.pool import Pool, PoolMeta
-from trytond.transaction import Transaction
+from trytond.pool import PoolMeta
 
 __all__ = [
     'ProductConfiguration',
diff --git a/product.py b/product.py
index 2766e29..080c0fa 100644
--- a/product.py
+++ b/product.py
@@ -1,8 +1,6 @@
 #This file is part product_purchase_sequence module for Tryton.
 #The COPYRIGHT file at the top level of this repository contains
 #the full copyright notices and license terms.
-
-from trytond.model import ModelView, ModelSQL, fields
 from trytond.pool import Pool, PoolMeta
 
 __all__ = ['Product']
diff --git a/setup.py b/setup.py
index 7bf1227..0bdef4e 100755
--- a/setup.py
+++ b/setup.py
@@ -5,7 +5,6 @@
 
 from setuptools import setup
 import re
-import os
 import ConfigParser
 
 config = ConfigParser.ConfigParser()
diff --git a/tests/test_product_purchase_sequence.py b/tests/test_product_purchase_sequence.py
index 4899309..4e04a5e 100755
--- a/tests/test_product_purchase_sequence.py
+++ b/tests/test_product_purchase_sequence.py
@@ -12,9 +12,7 @@ if os.path.isdir(DIR):
 
 import unittest
 import trytond.tests.test_tryton
-from trytond.tests.test_tryton import POOL, DB_NAME, USER, CONTEXT, test_view,\
-    test_depends
-from trytond.transaction import Transaction
+from trytond.tests.test_tryton import test_view, test_depends
 
 
 class ProductPurchaseSequenceTestCase(unittest.TestCase):