diff --git a/tests/test_carrier_percentage.py b/tests/test_carrier_percentage.py
index 4a250b0170..99afe7e4e5 100644
--- a/tests/test_carrier_percentage.py
+++ b/tests/test_carrier_percentage.py
@@ -13,9 +13,8 @@ import doctest
 from decimal import Decimal
 import trytond.tests.test_tryton
 from trytond.tests.test_tryton import POOL, DB_NAME, USER, CONTEXT, \
-    test_view, test_depends
+    test_view, test_depends, doctest_dropdb
 from trytond.transaction import Transaction
-from trytond.backend.sqlite.database import Database as SQLiteDatabase
 
 
 class CarrierWeightTestCase(unittest.TestCase):
@@ -89,19 +88,6 @@ class CarrierWeightTestCase(unittest.TestCase):
                     (price, currency.id))
 
 
-def doctest_dropdb(test):
-    '''
-    Remove sqlite memory database
-    '''
-    database = SQLiteDatabase().connect()
-    cursor = database.cursor(autocommit=True)
-    try:
-        database.drop(cursor, ':memory:')
-        cursor.commit()
-    finally:
-        cursor.close()
-
-
 def suite():
     suite = trytond.tests.test_tryton.suite()
     from trytond.modules.product.tests import test_product